H5
IPM protection
Connect wires according to
the phase sequence.
Compressor 3-phase wire connection is
lack of phase or phase-reversing?
YES
System is heavy-loaded? Compressor
current is too large?
NO
YES
Normal protection
NO
Replace the drive board.
Error still exists?
Replace the compressor.
YES
3.4.20 ―H6‖ DC Fan Error
Error display: ODU mainboard, IDU wired control and IDU receiver light board will display H6
Error judgment condition and method:
Mainboard doesn‘t receive the signal of outdoor fan within 30s after the outdoor fan starts up.
Possible reason:
■Outdoor fan wiring terminal is not correctly connected to the mainboard.
■Outdoor fan is damaged.
■If it is a new unit or a new motor has been replaced in the unit and the wire connection is correct, then probably it is
the program that goes wrong.
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