GREE DC INVERTER HEAT PUMP CONDENSING UNIT
36
Troubleshooting:
Malfunction of ODU memory chip
error
Replace the outdoor
mainboard
3.4.9 “H4” Overload
Error display:
ODU mainboard LED displayer
Error judgment condition and method:
When condensing pressure is higher than the protection value, system will report overload protection.
Possible reason:
■Cooling ODU heat exchanger is blocked or heat exchange is bad.
■Heating IDU heat exchanger is blocked or heat exchange is bad.
■Operating temperature is too high.
■System charging quantity is too much.
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