P0 Driver reset protection
3.3V drive board
voltage is normal or
not?
Replace the drive board
Re-arrange the wires. Heavy
current wires s hould avoid
the drive board chip.
NO
YES
3.4.27 ―P5‖ Over-Current Protection
Error display: ODU mainboard, IDU wired control and IDU receiver light board will display P5
Error judgment condition and method:
If compressor‘s instant current value is higher than the set current protection value, then it can be judged that
compressor over-current occurs and system will shut down for protection.
Possible reason:
■System load is too much and compressor current is too large.
■Compressor 3-phase wire connection is lack of phase or phase-reversed.
■Compressor phase wire is loose or has bad contact.
■Drive board current sampling circuit element is damaged or drive chip current sampling AD terminal is
abnormal.
■Compressor is damaged.
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