GREE U-Match 5 SERIES UNIT SERVICE MANUAL
65
Troubleshooting
：
Compressor is running at high frequency and high load
. The peak
current has reached the protection value?
Compressor 3-phase wire connection
is correct or not?
P5
Compressor over -current
protection
Compressor 3-phase wires are
loose or badly connected?
Error still exists ?
Normal protection
Reconnnect wires
according to the correct
sequence.
Reconnect wires or replace
the compressor wires .
Replace the drive board
Replace the compressor
YES
NO
YES
YES
NO
YES
NO
3.4.28
―P6‖ Master Control and Driver Communication Error
Error display:
ODU mainboard, IDU wired control and IDU receiver light board will display
P6
Error judgment condition and method:
If there is no other malfunction and the communication between master control and driver is cut off for 30s,
then it can be judged that the communication between master control and driver is faulted. System will shut down
for protection.
Possible reason:
■Communication wire between master control and driver is not well connected, or has bad contact, or is broken.
■The switch power of drive board is abnormal, therefore, the 3.3V power voltage is abnormal.
■Communication circuit of the drive board or the master control board is abnormal.
