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 control 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.
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