Mitsubishi air conditioner E1, E2, E3, E4, E5, E6 and other faults, how to troubleshoot and repair?

1. Split system

Whether there is a fault in the indoor and outdoor units can be known by the access code of the remote control, the content of the green LED (power indicator and microcomputer normal indicator) or the red LED (check indicator) of the indoor/outdoor unit.

Mitsubishi Heavy Industries' Haier air conditioner

Figure 1: Mitsubishi Heavy Industries' Haier air conditioner.
(Go to Okmarts and pick the Mitsubishi Heavy Industries Compressor you need)

2. Mitsubishi air conditioner fault code

E1: Operating switch wire broken, air inside the machine circuit board is bad.
E2: empty inside position number repeated / empty inside board bad.
E3: no corresponding outdoor unit number inside and outside signal line broken.
E4: indoor unit number set incorrectly (set 48 or 49).
E5: Abnormal communication between inside and outside. E5: Communication between inside and outside is abnormal.
E6: The indoor unit heat exchanger thermistor is bad, and the internal board is bad.
E7: Bad indoor unit suction resistor, bad internal board.
E8: High temperature of heat exchanger of indoor unit (heating), short circuit of heat exchanger thermistor of inner unit.
E10: Too many times when operating the switch multiple control.
E31: Duplicate outdoor unit number, bad external board.
E32: Inverted phase into missing phase, bad external unit board.
E33: Compressor overcurrent. E33: Compressor overcurrent.
E34: The primary of 52C is missing T phase.
E35: Outer unit temperature is too high, short circuit of outside thermistor, short circuit of outside unit.
E36: Compressor outlet cold pipe temperature is too high.
E38: Thermistor of outdoor unit temperature is bad'.
E39: compressor outlet cold tube temperature thermistor is bad.
E40: Compressor high pressure is too high.
uA: Outdoor and indoor units do not match or have different serial numbers.
uf: Circuit receiving head is faulty.



Mitsubishi Heavy Industries' Haier air conditioner General failure

Figure 2: Mitsubishi Heavy Industries' Haier air conditioner General failure



Detection light (yellow)

Detection light (green)

Line controller display code

Cause of failure

Flashing 3 times

 

E1

Line controller and indoor unit communication failure

Flashing 3 times

 

E5

Poor communication inside and outside the prion

Flashing 1 times

 

E6

Indoor coil inlet T2 fault

Flashing 1 times

 

E6

Indoor coil middle T3 fault

Flashing 1 times

 

E6

Indoor coil outlet T4 fault

Flashing 2 times

 

E7

Room temperature T1 fault

Flashing 6 times

 

E8

Heating room exceeds load

Flashing 4 times

 

E9

Water full, defective drain pump

Flashing 1 times

 

E28

Line controller, temperature sensor fault

 

Flashing 7 times

E32

Outdoor phase sequence fault

 

Flashing 7 times

E33

Outdoor overcurrent fault

 

Flashing 4 times

E40

Air outside exhaust temperature abnormal DLT red zone

 

Flashing 1 times

E37

Outdoor coil inlet T6 fault

 

Flashing 1 times

E37

Outdoor check pipe middle 17 fault

 

Flashing 1 times

E37

Outdoor coil outlet fault

 

Flashing 2 times

E38

Outdoor ambient temperature T5 fault

 

Flashing 4 times

E39

Outdoor exhaust temperature sensor disconnection

 

Flashing 5 times

E40

Outdoor high pressure fault

 

Flashing 5 times

E57

Outdoor low pressure fault

 

Flashing all the time

Operating mode conflict between indoor units



Mitsubishi Heavy Industries Haier air conditioning display E57 more accurately explained should be, serious imbalance, high pressure is too low to cause a serious drop in flow (capillary fixed throttling);
press unloading (but running). E2: indoor unit evaporator anti-freeze protection.



fault code e

Figure 3: fault code E*



fault code e

Figure 4: fault code E*



fault code e

Figure 5: fault code E*

Possible causes fault code E2:

the first step to determine whether it is a control failure or system failure, you can first take out the indoor tube temperature package from the evaporator, if it does not appear, it means that it is a system problem; the second step to check whether the indoor ambient temperature is too low, whether the indoor fan speed is too low, whether the indoor evaporator is too dirty, and whether the system is blocked. The cause of its frost may be: 1) system fluoride deficiency, available pressure gauge to measure the system pressure, using a clamp meter.
Mitsubishi Heavy Industries Haier air conditioner display e57 fault code, what is the reason? ...

Fault code: E5

Fault content: indoor unit and outdoor unit communication failure
Cause of failure.
1, check whether the pins are loose poor contact or broken wire.
2, check whether the internal machine control circuit board is normal.
3, check whether the external machine control circuit board is faulty.
4, check whether the main control circuit board is faulty.

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