Mitsubishi air conditioner error codes

Air conditioners fill our life with comfort, but because of a number of factors these appliances can break down, whatever high-quality they were. But there are manufacturer plants, which care of their image. Thus, they designed and introduced a complex and efficient diagnostic system into their appliances. Mitsubishi air conditioner error codes belong to it.

Mitsubishi PUH18EK air conditioner error codes

Blinking LEDDiagnosis of malfunctionCauseCheck point
LD1Reversed phaseThis model does not have this function.No need to be checked.
LD2Open phaseThis model does not have this function.No need to be checked.
LD3Outdoor coil thermistor is abnormal. (Open circuit or short circuit)• Outdoor coil thermistor is broken.• Measure the resistance of the thermistor.
• Thermistor was connected incorrectly.• Check the thermistor. If normal, replace the out- door controller board.
LD4High pressure switch (63H2) function• 63H2 was badly connected.• Check 63H2 and the outdoor fan motor.
• 63H2 was working.• Check if refrigerant supply is low.
• Check if air cycle is short-cycled.
LD5Thermal relay function (PUH42EK7)• 51C is working.• Check 51C.
LD6Thermal switch (26C) function (PUH42EK7) (PUH42EK7i)• 26C was connected incorrectly.• Check 26C.
• 26C is working.• Check if refrigerant supply is low.
• Check if the capillary tube is clogged.
LD7Over heat protection• The thermistor is broken.• Measure the resistance ot the thermistor.
• Coil temperature is over 153T.• Check the outdoor fan motor.
• Check if air cycle is short-cycled.
LD8Input circuit of outdoor con- troller board is abnormal.• Pulse input is abnormal.• Replace the outdoor controller board.

Mitsubishi SUZ-KA35VA air conditioner error codes

Wred remole controller
Check code
Wireless remote controller
Beeper souxlsflPERATlON INDICATOR lamp blinks (Number of times)
Symptom
P11Intake sensor error
P22Pipe (TH2) sensor error
P9Pipe (TH5) sensor error
E6.E73Indoor/outdoor unit communication error
P44Drain sensor error/Float switch connector open
P55Drain pump error
P66Freezing/Overheating protection operation
EE7Communication error between indoor and outdoor units
P88Pipe temperature error
E4, E59Remote controller signal receiving error
Fb12Indoor unit control system error (memory error, etc.)
EO. E3-Remote controller transmission error
E1.E2-Remote controller control board error
E91Indoor/outdoor unit communication error (Transmitting error) (Outdoor unit)
UP2Compressor overcurrent interruption
U3.U43Open/short of outdoor unit thermistors
UF4Compressor overcurrent interruption (When compressor locked)
U25Abnormal high discharging temperature/insufficient refrigerant
U1,Ud6Abnormal high pressure (63H worked)/Overheating protection operation
U57Abnormal temperature of heat sink
U88Outdoor unit fan protection stop
U69Compressor overcurrent interruption/Abnormal of power module
U710Abnormality of super heat due to low discharge temperature
U9,UH11Abnormality such as overvoltage or voltage shortage and abnormal synchronous signal to main circuit/Current sensor error
Others14Other errors

Error codes and troubleshooting