Error codes for Mitsubishi Electric air conditioners

P1 

Temperature sensor malfunction TH3 

P2 

Sensor reading TH5 heat exchanger malfunction 

R4 

The drain pan is full above normal (CN4F float sensor may also malfunction) 

Р5 

Malfunction of a pump installed in the drainage compartment 

R6 

Incorrect execution of the command to lower or raise the temperature 

P8 

Incorrect temperature set in the heat exchanger. 

R9 

Malfunctioning sensor reading data from the TH2 heat exchanger 

RA 

The compressor was stopped and forced to stop. 

E0 

Cannot transmit signal to control panel 

E1 

The buttons on the remote control are faulty 

E2 

Addresses of internal systems are duplicated 

E3 

The address of the outdoor unit is incorrect 

E4; 

E5 

The remote control signal receiver is faulty 

E6 

There is a short circuit in the connection of the indoor and outdoor unit 

E7 

Error transferring data in the system 

E8 

Open circuit near the data reception sensor 

E9 

Unable to contact transmitter 

E0 

Remote control battery low 

EA 

Incorrect installation of mains and wire connections 

EB 

Power Surge Protection 

EC 

Failed to start the system timer 

ED

It is necessary to reset everything to the basic settings 

EE 

Unable to transfer data to the transmitter 

EF 

M-NET Error - Incorrect Wiring 

U1 

Sensor 63H indicates a pressure above normal (or a temperature above normal) 

U1 

Fatal error 

U2 

49C sensor indicates low pressure with air intake or low refrigerant 

U2 

The compressor runs at high temperature 

U3 

Capacitor varistor defective 

U4 

There is an open or short circuit in the power supply circuit of the outdoor temperature sensor 

U5 

Condenser temperature sensor signals excess 

U6 

Compressor current overload detected, device stopped 

U7 

49C sensor indicates an error 

U8 

Forced stop of the fan motor installed in the outdoor unit 

U9; UH 

Deviation from the norm of the voltage of the electric current coming from the network, an error in the readings of the voltage sensor 

UA 

Compressor start relay error 

UD

Compressor overheated 

UL 

Low refrigerant pressure 

UF 

Voltage too high, compressor stop 

UP 

Power overload, forced compressor shutdown 

Fb 

Programming error 

F1 

No data from temperature sensor TH3 

F2 

Phase failure at L3 

F3 

Incorrect connection to internal control board - no signal 

F4 

Open connector 

F7 

The sequence in the loop phases is broken 

F8 

Unstable mains voltage 

F9 

No signal in connectors 

FA 

Phase failure in sections L2 

E0 

I can’t send a command to the air conditioner 

Р1 

Air intake data not read correctly 

P2 

Tubing failure 

P3 

System error 

R4 

No data from the Drain sensor 

Р5 

Mechanism overflow leakage 

R6 

Incorrect temperature reduction or increase 

Р7 

System error (data generation) 

P8 

Connection break 

Transaction Status

Check for error code 

LD1 

Compressor 

LD2 

Temperature adjustment 

LD3 

Operation 63H3 

LD4 

The compressor operates during operation 63H2 

LD5 

Fan on 

LD6 

Four way valve working 

LD7 

Bypass valve 

LD8 

The crankcase heater is working 

LED indication 

Flash every 2 seconds 

Faulty converter power, external power, thermistor, or outdoor unit control system 

Two flashes every 2 seconds 

Short circuit protection 

Three flashes every 2 seconds 

Protection against exceeding the normal temperature of the discharge system 

Four flashes every 2 seconds 

Thermistor over temperature protection 

Five flashes every 2 seconds 

System overpressure protection 

Seven flashes every 2 seconds 

Protection against accidental start of the system 

Eight flashes every 2 seconds 

Temperature error protection 

One flash 

Mains voltage decreased 

Three flashes 

Defrost triggered 

Four flashes 

High discharge system temperature 

Five flashes 

Outdoor thermistor 

Seven flashes 

Low discharge temperature 

Eight flashes 

The converter is protected 

Nine flashes 

Invert r checked