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.
36
SERVICE MANUAL
Summary of Contents for Inverter FLEX24 DEV24H2R18
Page 9: ...6 SERVICE MANUAL 2 Control 2 1 Operation Mode 2 1 1 Cooling Mode ...
Page 10: ...2 1 2 Heating Mode SERVICE MANUAL 7 ...
Page 19: ...Model DEV48H2R18 DEV60H2R18 16 SERVICE MANUAL ...
Page 27: ...SEV2040H2R18 SEV4060H2R18 24 SERVICE MANUAL ...