Everwell MKTH1223E-16 - 3.2.20 Troubleshooting F6: Compressor Phase Protection

Air Conditioner Service Manual
49
3.2.20 F6 The Compressor Lack of phase / Anti-phase protection.
If ODU PCB can’t test one, or even three phase of compressor current, it will show F6 protection.
Display F6
Check compressor
wiring connector, is
it well connected?
Re-connect
The Compressor
wiring in good quality?
Replace the wires
Compressor phase-
current test circuit failure
Replace ODU PCB
End
Replace compressor
No
No
No
Yes
Yes
Yes
Problem solved?
Problem solved?
Problem solved?
Yes
No
No
Yes
Check U,V,W phase
whether right?
Switch any two wire
U,V and W
Measure the resistance
valve of terminals U,V,W of
compressor with a
resistance measuring meter
Whether the
resistance valve is
almost same?
Measure the resistance
valve of terminals U,V,W of
compressor and the copper
pipe with a resistance
measuring meter
Whether the resistance
valve is more than
500ohm?
Yes
No
Yes
No
Yes