Mitsubishi duct air conditioner error codes. Mitsubishi Electric Air Conditioner Error Codes. Troubleshooting climate systems
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Decryption |
Russian translation |
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Intake sensor error |
Input sensor error |
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Pipe (TH5) sensor error |
TH5 heat exchanger sensor error (according to the diagram) |
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Drain sensor error/Float switch connector (CN4F) open |
Overflow of the drain pan, or breakage of the float sensor CN4F |
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Drain pump error |
Drain pump error |
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Freezing/Overheating protection operation |
Frost or overheat error |
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pipe temperature error |
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Pipe (TH2) sensor error |
Error on the heat exchanger sensor TH2 |
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Forced compressor stop(due to water leakage abnormality) |
Forced stop of the compressor (due to overfilling drainage system) |
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Remote controller transmission error |
No communication with the control panel |
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remote controller control board error |
Control board defective |
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remote controller signal receiving error |
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Indoor/outdoor unit communication error (Transmitting error) (Outdoor unit) |
No communication between indoor and outdoor unit (Outdoor unit error) |
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Communication error between indoor and outdoor units |
No inter-unit communication between indoor and outdoor units |
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Abnormal high pressure (63H worked)/Overheating protection operation |
High pressure on the 63H sensor, or overheating protection |
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Abnormal high discharging temperature/49C worked/insufficient refrigerant |
Sensor 49C tripped, very low discharge pressure, lack of refrigerant |
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Open/short of outdoor unit thermistors |
Break, short circuit of the thermal sensor outdoor unit |
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Abnormal temperature of heat sink |
Condenser temperature not correct |
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Compressor overcurrent interruption/Abnormal of power module |
Compressor forcedly stopped due to current overload, power module is faulty |
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Abnormality of super heat due to low discharge temperature |
49C sensor tripped / very low discharge pressure / lack of refrigerant |
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Outdoor unit fan protection stop |
Outdoor unit fan motor stopped |
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Abnormality such as overvoltage or voltage shortage and abnormal synchronous signal to main circuit/Current sensor error |
Over / under voltage supply, current sensor malfunction |
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Compressor overcurrent interruption (When compressor locked) |
Compressor stopped due to current overload, compressor stuck |
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Compressor overcurrent interruption |
Compressor stop due to overcurrent |
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Indoor unit control system error (memory error, etc.) |
Control board error indoor unit(EEPROM, etc.) |
Code EA
Incorrect installation of the indoor/outdoor unit. Check interconnection, electrical circuit. Chain break.
Eb code
Incorrect installation, disconnection, protection tripped.
EU code
Error start by time, within 5 min. Turn off the power, de-energize the split system Mitsubishi Electric, remove the batteries from the remote control. Then do the operation after 5 minutes. in reverse order.
All split system settings will return to factory defaults.
Incorrect installation of the indoor / outdoor units usually leads to breakage of the split system.
Mitsubishi Electric inverter type, fault table.
Communication break.
Code E6
Indoor / outdoor unit connection error, signal reception sensor (no signal reception).
No signal, short circuit.
Code E7
Indoor/outdoor transmission unit error (transmission error).
No signal, short circuit.
Code E8
Error, the reception sensor does not work, check whether power is supplied to the sensor.
Chain break.
Code E9
Indoor/outdoor interconnect error.
Chain break. There is no signal.
Code E0 No signal from the control panel (signal reception)
Change the remote control batteries.
Code E3
Wrong signal. The control unit of the air conditioner does not generate the signal correctly.
Fix - See EU Code
Code E4
Check the interconnection, the integrity of the temperature and pressure sensors.
Code E5
Check mains voltage. Equipment malfunctions are possible.
EF code
M-NET error, no signal
Check interconnect, open connections or poor contact.
Code Ed
The signal generation sequence is violated. Stepper finder failure.
The fix, see Mitsubishi Electric EC code, is to reset the air conditioner to factory default settings.
Code P1
Mitsubishi Electric temperature sensor (TH1) not working.
Check the sensor for integrity. The seal of the sensor is broken, the sensor and the connecting cable are so dirty and wet that they short-circuit. Replace sensor if necessary
Code P2
Frostbite sensor of the indoor unit, the sensor has tripped.
Dirty indoor unit, poor airflow due to frostbite. Check the Mitsubishi Electric split system circuit for gas leaks.
Frostbite usually begins due to a lack of gas or air conditioning requires attention - prevention.
Code P4
Check drainage, drain, - the bathtub overflow sensor has tripped. Drain clogged.
Code P5
The drain does not work, the drainage engine is idling.
We repair split systems, Mitsubishi Electric air conditioners until 2006
Error codes. Mitsubishi Electric until 2006 release
Code P6
Error, -
Freezing / overheating protection tripped. Check the split system circuit for gas leaks.
Frostbite usually begins due to a lack of gas.
Code P8
The temperature regime has gone beyond the specified parameters, check the temperature sensor for integrity. The sensor resistance must be within 16 ohms.
Code P9
The temperature sensor is closed.
Check the sensor for integrity. The seal of the sensor is broken, the sensor and the connecting cable are so dirty and wet that they short-circuit (TH5)
Closure.
Code F1
Check the phasing on the compressor motor of the Mitsubishi Electric air conditioner outdoor unit.
Code F2
Error L3 phase failure.
Code F3
Error 63L no signal from the control board.
check the quality of the signal formation, check the sensors for integrity, possible reason, 0 - burnt contacts of the relay of inclusion, sticking of contacts, malfunction of the relay spring ...
Code F4
Error 49C connector open.
Code F9
Error - connector 2 or more no signal.
FA code
Error L2 - phase failure or 51cm connector is open.
Code F7
Loop phase sequence error, check cable condition.
Code F8
Power failure, check mains voltage.
Code U2
High temperature parameters of the compressor operation, overload protection has tripped.
Code U2
Error
Internal thermostat (49C) check the reasons for the operation, check the operating and starting currents of the air conditioning compressor, the supply voltage, the amount and pressure of freon gas in the refrigeration circuit of the split system.
Code U1
Pressure sensor (high pressure swicth 63H tripped)
Code U1
Fatal error.
UE code
Error
High pressure in the system, the ball valve is closed, the interblock route is blocked, the bypass valve does not work, it is scoring, stuck ... Knock knock-knock-knock.
UL code
Low pressure in the system, the sensor has tripped.
Ud code
The thermal protection of the air conditioning compressor has tripped. See Fix and Causes - Code U2
Code U6
Compressor overload. See error fix and cause - code U2
UA code
Compressor error. Check start relay.
UF Code
No start inhibit signal. Fatal error, everything is faulty, start the test again.
For example, look for malfunctions
a) malfunctions of the electrical part, electric system; power supply and air conditioning control. rice. one.
b) malfunctions of the refrigeration circuit, fig. 2.
Compressor start blocking, incorrect incoming and start-allowing parameters.
UH code
Current sensor error.
Code U3
Check capacitor, insufficient current smoothing, varistor defective.
Code U4
The temperature sensor of the outdoor unit of the air conditioner does not work.
Codes P1-P8 | Mitsubishi Electric .Slim K-control
The display on the Mitsubishi Electric remote control.
E0 LED light on
Diagnosis of a malfunction in the reception / transmission of an error signal.
No signal, sensor short circuit.
P1 LED light on
Intake air sensor fault diagnosis, error.
No signal, short circuit.
P2 LED light on
Pipe fault diagnosis, T-sensor abnormal.
There is no signal from the sensor, short circuit.
P4 LED light on
Drain sensor is abnormal, throw it in the trash.
P5 LED light on
Faulty connection, mechanism protection overflow leak.
No signal, short circuit.
P6 LED light on
Frostbite Sensor Abnomality Fault Diagnosis/Overheat Protection Mode.
No signal, short circuit.
P3 LED light on
Diagnosis of malfunction of the system error (signal transmission / reception).
No signal, short circuit.
P7 LED light on
Troubleshooting System error (address)
No signal, short circuit.
P8 LED light on
Fault diagnosis Outdoor fault block
Chain break.
Read more: Errors P1, P2, P3, P4, P5, P6
Mitsubishi Electric. - Mr.Slim K-control PUH-EK
outdoor unit
LED ON operation status =
LED Flash = Diplay Code Check
LED light LD1 is on
LED ON Compressor directive
LED flash phase sequence detect
Mitsubishi Electric LD2 LED light on
LED ON Heating Directive
LED Flash Open Phase Detection
LED light LD3 is on
LED ON During operation 63H1
LED flash pipe sensor short / open
The LD4 LED light is on
Compressor LED ON
LED flash high pressure swicth (63H2) operations.
The lD5 LED light is on
LED ON Open fan turn on
LED flash overcurrent relay (51cm) operation.
The LD6 LED light is on
LED ON 4-way valve ON
LED flash thermal swicth- LED (26C) operation.
The LD7 LED light is on
LED ON Bypass valve Mitsubishi Electric ON
LED flash Thermistor (TH3) overheating protection. Confucius
Fault codes.
Display on the remote control, press and hold the buttons on the remote control, CHECK and SET for 4 seconds
Mitsubishi Electric. Slim A-control
Code EA
Incorrect installation of the indoor/outdoor unit. Check interconnection, electrical circuit. Chain break.
Eb code
Incorrect installation, disconnection, protection tripped.
EU code
Error start by time, within 5 min. Turn off the power, de-energize the Mitsubishi Electric split system, remove the batteries from the remote control. Then do the operation after 5 minutes. in reverse order.
All split system settings will return to factory defaults.
Incorrect installation of the indoor / outdoor units usually leads to breakage of the split system.
Mitsubishi Electric inverter type, fault table.
Communication break.
Code E6
Indoor / outdoor unit connection error, signal reception sensor (no signal reception).
No signal, short circuit.
Code E7
Indoor/outdoor transmission unit error (transmission error).
No signal, short circuit.
Code E8
Error, the reception sensor does not work, check whether power is supplied to the sensor.
Chain break.
Code E9
Indoor/outdoor interconnect error.
Chain break. There is no signal.
Code E0 No signal from the control panel (signal reception)
Change the remote control batteries.
Code E3
Wrong signal. The control unit of the air conditioner does not generate the signal correctly.
Fix - See EU Code
Code E4
Check the interconnection, the integrity of the temperature and pressure sensors.
Code E5
Check mains voltage. Equipment malfunctions are possible.
EF code
M-NET error, no signal
Check interconnect, open connections or poor contact.
Code Ed
The signal generation sequence is violated. Stepper finder failure.
The fix, see Mitsubishi Electric EC code, is to reset the air conditioner to factory default settings.
Code P1
Mitsubishi Electric temperature sensor (TH1) not working.
Check the sensor for integrity. The seal of the sensor is broken, the sensor and the connecting cable are so dirty and wet that they short-circuit. Replace sensor if necessary
Code P2
Frostbite sensor of the indoor unit, the sensor has tripped.
Dirty indoor unit, poor airflow due to frostbite. Check the Mitsubishi Electric split system circuit for gas leaks.
Frostbite usually begins due to a lack of gas or air conditioning requires attention - prevention.
Code P4
Check drainage, drain, - the bathtub overflow sensor has tripped. Drain clogged.
Code P5
The drain does not work, the drainage engine is idling.
We repair split systems, Mitsubishi Electric air conditioners until 2006
Error codes. Mitsubishi Electric until 2006 release
Code P6
Error, -
Freezing / overheating protection tripped. Check the split system circuit for gas leaks.
Frostbite usually begins due to a lack of gas.
Code P8
The temperature regime has gone beyond the specified parameters, check the temperature sensor for integrity. The sensor resistance must be within 16 ohms.
Code P9
The temperature sensor is closed.
Check the sensor for integrity. The seal of the sensor is broken, the sensor and the connecting cable are so dirty and wet that they short-circuit (TH5)
Closure.
Code F1
Check the phasing on the compressor motor of the Mitsubishi Electric air conditioner outdoor unit.
Code F2
Error L3 phase failure.
Code F3
Error 63L no signal from the control board.
check the quality of the signal formation, check the sensors for integrity, possible cause, 0 - burnt contacts of the relay, sticking of contacts, malfunction of the relay spring ...
Code F4
Error 49C connector open.
Code F9
Error - connector 2 or more no signal.
FA code
Error L2 - phase failure or 51cm connector is open.
Code F7
Loop phase sequence error, check cable condition.
Code F8
Power failure, check mains voltage.
Code U2
High temperature parameters of the compressor operation, overload protection has tripped.
Code U2
Error
Internal thermostat (49C) check the reasons for the operation, check the operating and starting currents of the air conditioning compressor, the supply voltage, the amount and pressure of freon gas in the refrigeration circuit of the split system.
Code U1
Pressure sensor (high pressure swicth 63H tripped)
Code U1
Fatal error.
UE code
Error
High pressure in the system, the ball valve is closed, the interblock route is blocked, the bypass valve does not work, it is scoring, stuck ... Knock knock-knock-knock.
UL code
Low pressure in the system, the sensor has tripped.
Ud code
The thermal protection of the air conditioning compressor has tripped. See Fix and Causes - Code U2
Code U6
Compressor overload. See error fix and cause - code U2
UA code
Compressor error. Check start relay.
UF Code
No start inhibit signal. Fatal error, everything is faulty, start the test again.
For example, look for malfunctions
a) malfunctions of the electrical part, electric system; power supply and air conditioning control. rice. one.
b) malfunctions of the refrigeration circuit, fig. 2.
Compressor start blocking, incorrect incoming and start-allowing parameters.
UH code
Current sensor error.
Code U3
Check capacitor, insufficient current smoothing, varistor defective.
Code U4
The temperature sensor of the outdoor unit of the air conditioner does not work.
Codes P1-P8 | Mitsubishi Electric .Slim K-control
The display on the Mitsubishi Electric remote control.
E0 LED light on
Diagnosis of a malfunction in the reception / transmission of an error signal.
No signal, sensor short circuit.
P1 LED light on
Intake air sensor fault diagnosis, error.
No signal, short circuit.
P2 LED light on
Pipe fault diagnosis, T-sensor abnormal.
There is no signal from the sensor, short circuit.
P4 LED light on
Drain sensor is abnormal, throw it in the trash.
P5 LED light on
Faulty connection, mechanism protection overflow leak.
No signal, short circuit.
P6 LED light on
Frostbite Sensor Abnomality Fault Diagnosis/Overheat Protection Mode.
No signal, short circuit.
P3 LED light on
Diagnosis of malfunction of the system error (signal transmission / reception).
No signal, short circuit.
P7 LED light on
Troubleshooting System error (address)
No signal, short circuit.
P8 LED light on
Fault diagnosis Outdoor fault block
Chain break.
Read more: Errors P1, P2, P3, P4, P5, P6
Mitsubishi Electric. - Mr.Slim K-control PUH-EK
outdoor unit
LED ON operation status =
LED Flash = Diplay Code Check
LED light LD1 is on
LED ON Compressor directive
LED flash phase sequence detect
Mitsubishi Electric LD2 LED light on
LED ON Heating Directive
LED Flash Open Phase Detection
LED light LD3 is on
LED ON During operation 63H1
LED flash pipe sensor short / open
The LD4 LED light is on
Compressor LED ON
LED flash high pressure swicth (63H2) operation.
The lD5 LED light is on
LED ON Open fan turn on
LED flash overcurrent relay (51cm) operation.
The LD6 LED light is on
LED ON 4-way valve ON
LED flash thermal swicth- LED (26C) operation.
The LD7 LED light is on
LED ON Bypass valve Mitsubishi Electric ON
LED flash Thermistor (TH3) overheating protection.
The LD8 LED light is on
LED ON Crankcase heater ON
Mitsubishi Electric LED flash, passive input.
P1 - Intake sensor error
P2 - Pipe (TH5) sensor error
P9 - Pipe (TH2) sensor error
E6,E7 - Indoor/outdoor unit
P4 - Drain sensor error/Float switch connector (CN4F) open
P5 - Drain pump error
PA - Forced compressor stop(due to water leakage abnormality)
P6 - Freezing/Overheating protection operation
EE - Communication error between indoor and outdoor units
P8 - Pipe temperature error
E4,E5 - Remote controller signal receiving error
Fb - Indoor unit control system error (memory error, etc.)
E0,E3 - Remote controller transmission error
E1,E2 - Remote controller control board error
E9 - Indoor/outdoor unit communication error (Transmitting error) (Outdoor unit)
UP - Compressor overcurrent interruption
U3,U4 - Open/short of outdoor unit thermistors
UF - Compressor overcurrent interruption (When compressor is locked)
U2 - Abnormal high discharging temperature/49C worked/insufficient refrigerant
U1,Ud - Abnormal high pressure (63H worked)/Overheating protection operation
U5 - Abnormal temperature of heat sink
U8 - Outdoor unit fan protection stop
U6 - Compressor overcurrent interruption/Abnormal of power module
U7 - Abnormality of super heat due to low discharge temperature
U9,UH - Abnormality such as overvoltage or voltage shortage and abnormal synchronous signal to main circuit/Current sensor error
E1 - failure printed circuit board indoor unit, the remote controller is connected incorrectly or is defective.
E2 - duplication of addresses of indoor units
E3 - incorrect address of the outdoor unit
E5 - Faulty outdoor unit control board
E6 - evaporator temperature sensor closed / broken
E7 - sensor of the indoor unit is closed / broken
E8 - evaporator overload or sensor defective
E9 - error drainage pump or float switch
E10 - more than 16 indoor units connect with the controller
E11 - more than one unit is connected to the control panel when the address is occupied
E12 - address setting error
E14 - incorrect master-slave connection settings (master-slave)
E16 - indoor unit fan defective
E28 - control panel sensor defective
E30 - outdoor / indoor unit connection error
E31 - duplication, incorrect address settings
E32 - incorrect phase sequence or wire break
E33 - compressor winding break
E34 - open phase L3 winding 52C
E35- heat condenser or defective temperature sensor
E36 - unacceptable deviation in outlet air temperature
E37 - defective condenser temperature sensor
E38 - Outside air temperature sensor defective
E39 - the temperature sensor of the discharge pipe is faulty
E40 - high pressure switch 63H1 has tripped
E49 - the system has stopped, low pressure or not enough refrigerant
E52 - failure at 52C
E53 - Faulty suction pipe thermistor
E54 - low pressure sensor disconnected
E55 - defective thermistor temperature of the internal space of the compressor
E56 - power transistor thermal sensor is defective or broken
E57 - insufficient refrigerant
E59 - compressor does not start
E60 - compressor positioning error
E63 - emergency shutdown of the indoor unit
Error code decoding table
| Decryption | Russian translation | |
| P1 | Intake sensor error | Input sensor error |
| P2 | Pipe (TH5) sensor error | TH5 heat exchanger sensor error (according to the diagram) |
| P4 | Drain sensor error/Float switch connector (CN4F) open | Overflow of the drain pan, or breakage of the float sensor CN4F |
| P5 | Drain pump error | Drain pump error |
| P6 | Freezing/Overheating protection operation | Frost or overheat error |
| P8 | pipe temperature error | |
| P9 | Pipe (TH2) sensor error | Error on the heat exchanger sensor TH2 |
| PA | Forced compressor stop(due to water leakage abnormality) | Forced stop of the compressor (due to overflow of the drainage system) |
| E0, E3 | Remote controller transmission error | No communication with the control panel |
| E1, E2 | remote controller control board error | Control board defective |
| E4, E5 | remote controller signal receiving error | |
| E9 | Indoor/outdoor unit communication error (Transmitting error) (Outdoor unit) | No communication between indoor and outdoor unit (Outdoor unit error) |
| EE | Communication error between indoor and outdoor units | No inter-unit communication between indoor and outdoor units |
| U1,Ud | Abnormal high pressure (63H worked)/Overheating protection operation | High pressure on the 63H sensor, or overheating protection |
| U2 | Abnormal high discharging temperature/49C worked/insufficient refrigerant | Sensor 49C tripped, very low discharge pressure, lack of refrigerant |
| U3, U4 | Open/short of outdoor unit thermistors | Break, short circuit of the temperature sensor of the external unit |
| U5 | Abnormal temperature of heat sink | Condenser temperature not correct |
| U6 | Compressor overcurrent interruption/Abnormal of power module | Compressor forcedly stopped due to current overload, power module is faulty |
| U7 | Abnormality of super heat due to low discharge temperature | 49C sensor tripped / very low discharge pressure / lack of refrigerant |
| U8 | Outdoor unit fan protection stop | Outdoor unit fan motor stopped |
| U9, UH | Abnormality such as overvoltage or voltage shortage and abnormal synchronous signal to main circuit/Current sensor error | Over / under voltage supply, current sensor malfunction |
| UV | Compressor overcurrent interruption (When compressor locked) | Compressor stopped due to current overload, compressor stuck |
| U.P. | Compressor overcurrent interruption | Compressor stop due to overcurrent |
| fb | Indoor unit control system error (memory error, etc.) | Indoor control board error (EEPROM, etc.) |
Error codes for household air conditioners
You can determine the error in household split systems by flashing indicators on the panel of the indoor unit.
The Japanese company Mitsubishi Electric, whose main activities are the production of electrical systems, equipment for residential buildings, industrial automation systems, electronic devices, as well as information and communication systems, was founded in 1921. Separated from an ocean-going electric motor company, it expanded beyond Japan in a few decades. In 1980, the company's advanced technology products conquered the markets of Europe, America, Asia, Africa and Australia.
Today Mitsubishi Electric Corporation has offices and factories located in 35 countries of the world, about 110 thousand highly professional employees and an annual turnover of more than 36 billion dollars.
Some of the most famous Mitsubishi products are various models air conditioners, different the highest quality and using unique manufacturing techniques. Triple control of product characteristics (at the stage of receipt of components, at the stage of assembly and after removal from the conveyor) allows devices to work even in the most severe operating conditions.
One of the most popular series of wall-mounted air conditioners is MSZ-GC/GB/GA, featuring low noise and high efficiency. These air conditioners are equipped with a full size anti-oxidant air filter with a lifespan of 9-10 years and an anti-allergic filter insert. The developed self-diagnostics system independently eliminates minor flaws in the operation of the device. The inverter reduces power consumption and increases the service life of the machine. A huge number of built-in and external control systems makes it easy to set up necessary functions.
Wall-mounted inverter air conditioners of the MSZ-GE series (MSZ-GE25VA, etc.) are devices with an unprecedentedly low noise level. This is the quietest climate device among all products manufactured by Mitsubishi. It is equipped with proprietary antioxidant and anti-allergic air purification. High energy efficiency and relatively low price make these devices attractive to a wide range of consumers.
Since 2011, the design series of MSZ-EF wall-mounted air conditioners has been on sale. They feature exquisite art design, small size and high efficiency. The presence of the latest development - a nano-platinum filter, a complex system of shutters that creates the optimal speed of the air jet, as well as the "auto-restart" function allows you to use this climatic device in various rooms.
MSZ-FD DELUXE elite series of domestic air conditioners (MSZ-FD25VA, etc.) is a new series of split systems featuring high energy efficiency and quiet operation. All models are equipped with an active filter (dual plasma - PLASMA DUO) and an I-SEE sensor that can scan the room to maintain a uniform temperature. Low noise level and very high efficiency distinguish these Mitsubishi Electric air conditioners from products from other manufacturers.
MSC-GE-VB/MU-GA-VB series wall mounted air conditioners are designed for cooling and heating a small space. These split systems, including models MSC-GA25VB, MSC-GA20VB, MSC-GE20VB and others, are equipped with filters with antioxidant and anti-allergic properties. Low noise level, wide angle of the air jet, the presence of a system for setting parameters depending on the desire of the consumer - all these features make it possible to use this device both in apartments and small offices.
Inverter floor air conditioners of the MFZ-KA series are used in rooms where it is impossible to install a wall-mounted climate control device. They can blow air in different directions. The small size, low noise level, the presence of a switching power supply and a voltage monitor chip help to eliminate the “freezing” of the device. Economy cooling mode "I save" allows you to reduce energy consumption.
SEZ-KD series ducted air conditioners can be used in rooms with exquisite design. The presence of a thin indoor unit will help minimize the ceiling space (when installing stretch ceiling). Easily integrated into any duct system.
Cassette air conditioners, namely the four-flow SLZ-KA series and the single-flow MLZ-KA series, are devices designed for cooling and heating rooms of various directions. They are equipped with special decorative panels, through which the change of various functions is carried out. The air supply direction can be adjusted according to necessary requirements.
All Mitsubishi Electric air conditioners, including multi-systems of the MXZ-2A/3A/4A/5A-VA series and the MXZ-8A140VA series, which have from 2 to 8 indoor units, are high-quality products presented in various price categories. Each of them has a number of features that allow these climate devices to be used for decades.
The air conditioner error codes displayed on the display will help you solve the problems that have arisen in a few simple steps. To quickly fix the problem, select the desired code from the list and follow the instructions.
MITSUBISHI MR SLIM P (A) series air conditioner error codes
MITSUBISHI MR SLIM P SERIES (A) ERROR CODE: A0
CENTRAL CONTROLLER: 6600
SUBSCRIBER PROBLEM: Duplicate address - Lossnay blocks connected with the same address change addresses and reset block power
MITSUBISHI MR SLIM P SERIES (A) CODE ERRORS : A2
CENTRAL CONTROLLER: 6602
ACTIVATION PROBLEM: Transmitter Processor Hardware Error (Lossnay) - check communication wiring and possible malfunction Lossnay boards
CENTRAL CONTROLLER A3 : 6603
SUBSCRIBER PROBLEM: busy line, data cannot be transferred for 8 minutes - check A-M-Net connections (TB7 and TB3)
MITSUBISHI MR SLIM P SERIES (A) ERROR CODE: A6
CENTRAL CONTROLLER: 6606
SUBSCRIBER PROBLEM: Communication processor error - Lossnay address not transmitted - check M-Net voltage
MITSUBISHI MR SLIM P SERIES (A) ERROR CODE:
CENTRAL CONTROLLER A7 : 6607
SUBSCRIBER PROBLEM: No ACK signal - check A-M-Net wiring, transmit wiring out of range or faulty A-M-Net converter
MITSUBISHI MR SLIM P SERIES (A) ERROR CODE: A8
CENTRAL CONTROLLER: 6608
SUBSCRIBER PROBLEM: M-Net not responding - check A-M-Net wiring, transmission wiring range exceeded, defective A-M-Net converter or wrong wire used for M-Net connection
CENTRAL CONTROLLER EA : 6844
PROBLEM WITH THE DEVICE: Faulty / loose connection cables.
MITSUBISHI MR SLIM P SERIES (A) ERROR CODE: EB
CENTRAL CONTROLLER: 6845
PROBLEM WITH THE DEVICE: Wired / loose connecting cables. Wrong cable size / specification
MITSUBISHI MR SLIM P SERIES (A) ERROR CODE:
CENTRAL CONTROLLER EU : 6846
PROBLEM WITH THE SUBSCRIBER: Start time. After turning on the power, the device does not initialize. Wrong cable size / specification
MITSUBISHI MR SLIM P SERIES (A) ERROR CODE:
CENTRAL CONTROLLER ED : 403
ABS PROBLEM: Serial communication error. Communication error between boards on the outdoor unit caused by improper installation of the M-Net interface board
MITSUBISHI MR SLIM P SERIES (A) ERROR CODE:
CENTRAL CONTROLLER EF : 6607
SUBSCRIBER PROBLEM: Undefined error code. Turn off outdoor unit for 30 seconds, then turn it back on
MITSUBISHI MR SLIM P SERIES (A) ERROR CODE: E0
SUBSCRIBER PROBLEM: Communication error with remote control - check wiring, connections and communication voltage. Also check Master/Slave settings if multiple systems are connected
MITSUBISHI MR SLIM P SERIES (A) ERROR CODE: E1
MITSUBISHI MR SLIM P SERIES (A) ERROR CODE: E2
SUBSCRIBER PROBLEM: Remote control problem - if grouped, check addressing. If twinned, check the wiring to control indoors only
MITSUBISHI MR SLIM P SERIES (A) ERROR CODE: E3
PROBLEM WITH THE SUBSCRIBER: There is a problem with the remote control, check the addressing. If double check is connected to indoor only master
MITSUBISHI MR SLIM P SERIES (A) ERROR CODE: E4
MITSUBISHI MR SLIM P SERIES (A) ERROR CODE: E5
SUBSCRIBER PROBLEM: Remote control problem - not receiving - if grouped, check addressing. If twinned, check the wiring to control indoors only
MITSUBISHI MR SLIM P SERIES (A) ERROR CODE:
CENTRAL CONTROLLER E6 : 6840
PROBLEM WITH THE DEVICE: Internal or external communication error, mainly due to the inclusion of the outdoor unit before the indoor unit. Drain pump connected to S1 and S2 is causing interference
MITSUBISHI MR SLIM P SERIES (A) ERROR CODE: E7
SUBSCRIBER PROBLEM: Communication error between I/C and O/C - check condensate pump on I/C, reset power on O/C, check 12/24Vdc on S2 AND S3 possible failure of I/C board
MITSUBISHI MR SLIM P SERIES (A) ERROR CODE:
CENTRAL CONTROLLER E8 : 6840
PROBLEM WITH DEVICE: Crash intercom indoors (S2 / S3) - check that the connected pumps, check the internal insulator and try again in correct sequence i.e. indoors then outdoors
MITSUBISHI MR SLIM P SERIES (A) ERROR CODE:
CENTRAL CONTROLLER E9 : 6841
ACTIVATION PROBLEM: Loss of communication with the interior (S2 / S3) - check the connected pumps, check the internal isolator and restart in the correct sequence, i.e. outdoors
MITSUBISHI MR SLIM P SERIES (A) ERROR CODE:
CENTRAL CONTROLLER FA : 4108
SUBSCRIBER PROBLEM: 51CM connector open - check thermal relay for disconnect or contact failure.
MITSUBISHI MR SLIM P SERIES (A) ERROR CODE:
CENTRAL CONTROLLER F1 : 4103
SUBSCRIBER PROBLEM: Reverse phase detected - check power supply, try swapping phases.
MITSUBISHI MR SLIM P SERIES (A) ERROR CODE:
CENTRAL CONTROLLER F2 : 4102
ACTIVATION PROBLEM: phase L3 - check power and also check open circuit protection devices
MITSUBISHI MR SLIM P SERIES (A) ERROR CODE:
CENTRAL CONTROLLER F3 : 5202
ABS PROBLEM: 63L open - check low pressure switch.
MITSUBISHI MR SLIM P SERIES (A) ERROR CODE:
CENTRAL CONTROLLER F4 : 4124
PROBLEM WITH THE SUBSCRIBER: the internal thermostat of the air conditioner 49C is open
MITSUBISHI MR SLIM P SERIES (A) ERROR CODE:
CENTRAL CONTROLLER F5 : 5201
CUSTOMER PROBLEM: 63H open - check high pressure switch.
MITSUBISHI MR SLIM P SERIES (A) ERROR CODE:
CENTRAL CONTROLLER F7 : 4118
ACTIVATION PROBLEM: Phase Detect Circuit Malfunction - Faulty External Board
MITSUBISHI MR SLIM P SERIES (A) ERROR CODE: F8
PROBLEM WITH THE SUBSCRIBER: The input on the outdoor unit is not detected - the outdoor panel is faulty
MITSUBISHI MR SLIM P SERIES (A) ERROR CODE:
CENTRAL CONTROLLER F9 : 4119
SUBSCRIBER PROBLEM: Two or more security devices are open - check the security devices.
MITSUBISHI MR SLIM P SERIES (A) ERROR CODE: P1
SUBSCRIBER PROBLEM: Return air thermistor (TH1) error - check if TH1 is disabled or circuit open/closed
MITSUBISHI MR SLIM P SERIES (A) ERROR CODE: P2
PROBLEM WITH DEVICE: Faulty thermistor in pipe (TH2) check if TH2 is disconnected or open/close circuit
MITSUBISHI MR SLIM P SERIES (A) ERROR CODE: P4
SUBSCRIBER PROBLEM: Drain sensor failure - DS open or close circuit
MITSUBISHI MR SLIM P SERIES (A) ERROR CODE: P5
SUBSCRIBER PROBLEM: high level of condensate - failure of the drain pump or blockage in the drain
MITSUBISHI MR SLIM P SERIES (A) ERROR CODE: P6
PROBLEM WITH THE DEVICE: Freezing / overheating of the indoor unit of the heat exchanger - mainly due to a decrease in air flow through the internal coil. Dirty filters. Fan problem.
MITSUBISHI MR SLIM P SERIES (A) ERROR CODE: P8
UNIT PROBLEM: Abnormal pipe temperature caused by refrigerant leakage. Possibility of incorrect installation of the thermistor
MITSUBISHI MR SLIM P (A) SERIES CODE
ERRORS : P9 ACTIVATION PROBLEM: TH5 condenser/evaporator thermistor open/close circuit. Disconnected from the board.
MITSUBISHI MR SLIM P SERIES (A) ERROR CODE:
CENTRAL CONTROLLER U1 : 1302
PROBLEM WITH THE DEVICE: Shutdown high pressure - outdoor fan failure, coil blockage, blockage in the system, blockage of filters in the room during heating
MITSUBISHI MR SLIM P SERIES (A) ERROR CODE:
CENTRAL CONTROLLER U2 : 1102
PROBLEM WITH DEVICE: High Discharge Temperature - Compressor overheats due to lack of refrigerant, faulty thermistor, conditions environment. Can also be caused by a 49C trip (internal thermostat or external klixon)
MITSUBISHI MR SLIM P SERIES (A) ERROR CODE:
CENTRAL CONTROLLER U3 : 5104
SUBSCRIBER PROBLEM: Discharge Thermistor Error
MITSUBISHI MR SLIM P SERIES (A) ERROR CODE:
CENTRAL CONTROLLER U4 : 5105
SUBSCRIBER PROBLEM: External thermistor failure
MITSUBISHI MR SLIM P SERIES (A) ERROR CODE: U5
CENTRAL CONTROLLER: 4230
ACTIVATION PROBLEM: inverter heatsink temperature too high (TH8) - check for no airflow around the heatsink, no silicone paste, defective thermistor.
MITSUBISHI MR SLIM P SERIES (A) ERROR CODE:
CENTRAL CONTROLLER U6 : 4250
CUSTOMER PROBLEM: Compressor overload current, inverter output test and electrical checks on compressor need to be done
MITSUBISHI MR SLIM P SERIES (A) ERROR CODE:
CENTRAL CONTROLLER U7 : 1520
ABS PROBLEM: Low Overheat Discharge - Check if TH4 reading is correct. Check LEV transactions
Error codes, malfunctions and repairs Mitsubishi air conditioners Heavy
Mitsubishi Heavy Industries air conditioner troubleshooting and troubleshooting based on internal self-diagnosis results
Modern Mitsubishi Heavy Industries air conditioners have a very advanced self-diagnosis system, according to the results of which the control system, when a particular malfunction is detected, blocks the operation of the entire unit and at the same time reports the cause of the malfunction.
The Mitsubishi Heavy Industries air conditioner control system reports the occurrence of malfunctions by flashing the LED on the panel of the indoor (in some cases outdoor) unit. When a particular malfunction of the air conditioner is detected, the LEDs light up or flash in a certain sequence, which corresponds to the detected error. If the air conditioner control system has detected more than one error, then the malfunction with the highest priority is displayed first, and then all the others.
Error codes for Mitsubishi Heavy Industries air conditioners are shown in Table 2, 3, 4.
For correct diagnosis, before taking corrective action, check that the symptoms confirming the occurrence of a malfunction have reappeared.
Troubleshooting in the refrigeration circuit
Diagnosis of the state of operation by operating pressure and temperature difference
Accurate diagnosis requires skills that are acquired as a result of many years of practice: one malfunction can lead to another, sometimes several malfunctions from different sources can occur at the same time. It is easier to identify the sources of malfunctions if you monitor the operating condition of the air conditioner daily. Useful sign is the operating pressure and the temperature difference between the intake and discharge air. Table 1 provides some guidance.
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The information is given for semi-industrial air conditioners SERIES V-MULTI (Split- heat pump system):
(OUTDOOR UNIT) FDCA301HEN 301HES 401HEN 401HES 501HES 601HES 801HES 1001HES
(INDOOR UNIT) FDTA151 201 251 301 401 501, FDENA151 201 251 301 401 501, FDKNA151 201 251 301
