Gree GUD24W2/D-D(U) - Page 51

GREE DC INVERTER HEAT PUMP CONDENSING UNIT SERVICE MANUAL
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3.4.21 “P0” Driver Reset Protection
Error display:
ODU mainboard LED displayer
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
：
3.4.22 “P5” Over-Current Protection
Error display:
ODU mainboard LED displayer
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.