Midea ATOM B Series Service Manual page 55

Atom B Series VRF 50/60Hz
2.6 E5: Abnormal power supply voltage (For all models)
2.6.1 Digital display output
E5
2.6.2 Description
 Abnormal power supply voltage.
 The system stops running.
 Error code is displayed on the outdoor unit PCB.
2.6.3 Trigger / recover condition
 Trigger condition: Outdoor unit power supply phase voltage < 165V or > 265V.
 Recover condition: Outdoor unit power supply phase voltage is within 198V ~265V.
 Reset method: Resume automatically.
2.6.4 Possible causes
 Outdoor unit power supply voltage is abnormal.
 Loosened wiring within electric control box.
 Power wire or air switch selection is too small.
 Main PCB damaged.
2.6.5 Procedure
Voltage of power supply is stable between 165-265V
E5 occur when Compressor star or compressor operation
Test the L and N wire voltage of power supply to check
whether the voltage decrease rapidly when compressor star
Spot check the 13
same as actual voltage of L and N wire
Outdoor unit power off for 3 minutes and then repower on to
confirm whether the fault is occur again
Outdoor main control board is damaged
54
E5
Yes
period
No
th
input voltage to confirm whether it's the
No
Yes
No
Yes
Inspect whether power
supply wire diameter is too
small or poor connection
problem
No
Power supply abnormal