Midea V4 Plus S Series - E5: Malfunction of Power Supply Voltage

MCAC-VTSM-2015-09 R410A All DC Inverter V4+S Series 60Hz
Troubleshooting 137
4.5 E5: Malfunction of power supply voltage
The error will only display on faulty unit, all the ODUs will be on standby.
Note:
1) How to check for compressor
The normal resistance value of inverter compressor among U V W is 0.7~1.5Ω, and infinite to ground. If the resistance value is
out of the range, the compressor has malfunctioned.
2) How to check for fan motor
The normal value of DC fan motor coil among U V W is less than 10Ω. If the measured value is 0Ω, the fan motor is short
circuited.
3) How to check for inverter module output
Dial multi-meter to buzzer gear, measure any two terminals of P N and U V W of inverter module, if the multi-meter is ring, means
the inverter module is short circuited.
E5: Malfunction of power supply
voltage
Voltage of power supply is too high or
too low (the normal voltage between A
and N (B and N, C and N) should be
198V~242V)
Provide normal power supply
Check the high voltage circuit. 1)
compressor is short circuited; 2) fan
motor is short circuited, 3) inverter
module output malfunction, etc.
Replace the inverter module or
repair related parts
Outdoor main PCB is damaged
Replace the outdoor main PCB
No
No
Yes
Yes