Gree U-Match 5 Series - “P0” Driver Reset Protection; “P5” Over-Current Protection

GREE U-Match 5 SERIES UNIT SERVICE MANUAL
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3.4.26 “P0” Driver Reset Protection
Error display: ODU mainboard, IDU wired controller and IDU receiver light board will display P0
Error judgment condition and method:
Drive board chip resets and starts initialization. After the drive board is energized for 5s, it detects that the
chip resets again. In this case, it can be judged as drive chip reset protection.
Possible reason:
■3.3V drive chip supply voltage drop.
■TRST lead of JTAG programming is interrupted.
Troubleshooting：
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.