GREE DC INVERTER HEAT PUMP CONDENSING UNIT SERVICE MANUAL
41
Troubleshooting:
H
3 compressor overload
protection compressor overload
protection
Check if the over comp
. interface on the
mainboard is connection
Replace the
mainboard
Connection the over
comp
. interface
YES
NO
3.4.14 “PL” Bus Low-Voltage Protection
Error display:
ODU mainboard LED displayer
Error judgment condition and method:
When compressor is running and there is no other malfunction, if busbar voltage is lower than the set value
for low voltage protection, then it can be judged that bus low-voltage protection occurs. System will shut down for
protection.
Possible reason:
■Voltage of power grid is abnormal.
■Drive board busbar voltage sampling circuit element is damaged or drive board busbar voltage sampling
AD terminal is abnormal.
Troubleshooting
：
PL
Bus low-voltage protection
Grid voltage is normal or not
?
Normal
protection
Replace the dr ive
board .
YES
NO
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