Gree U-Match 5 Series - “H5” IPM Protection

GREE U-Match 5 SERIES UNIT SERVICE MANUAL
72
Troubleshooting：
Outdoor heat exchanger is blocked
Indoor heat exchanger is blocked.
Ambient temperature is out of the
operation range
H
4
Overload
Too much charging quantity.
Error still exists?
Remove the obstacle
Remove the obstacle
Normal protection. No
need to handle it.
Release a proper amount
of refrigerant
Replace the drive board
Replace the compressor
YES
YES
YES
YES
YES
NO
NO
NO
NO
3.4.19 “H5” IPM Protection
Error display: ODU mainboard, IDU wired controller and IDU receiver light board will display H5
Error judgment condition and method:
When power is connected and drive chip received IPM lead F0 that is of low level, than it is IPM module
malfunction. System will shut down for protection.
Possible reason:
■Compressor 3-phase wire connection is lack of phase or phase-reversed.
■System is overloaded and compressor current is too large.
■Drive board IPM module is damaged.
■Drive board IPM module’s 15V power supply is lower than 13.5V.
■Drive board 6-line PWM signal and the corresponding element are abnormal.
■Drive board compressor current sampling circuit element is damaged or drive chip current sampling AD terminal
is abnormal.
■Compressor is damaged.