Gree UM600PH/A-M, Service Manual

Page: 114 / 121

GREE Duct type Ducted Type Split Air-Conditioner Units
114
Condition and method for fault judgement
：
The code refers to quantity of state instead of error.
During the debugging, it means the master IDU has been successively set.
Possible cause: ——
Troubleshooting: ——
(59) Poor cooling/heating effect
Applicable model:
all IDUs.
Condition and method for fault judgement:
1) When IDU operates under cooling mode, and the electronic expansion valve opens to
480PLS, tube outlet temperature of IDU coil is 5
℃
or above over than tube inlet
temperature.
2) When IDU operates under heating mode, and the electronic expansion valve opens to
480PLS, tube inlet temperature of IDU coil is 12 ℃ or above less than corresponding
saturation temperature of high pressure.
Possible causes:
1) Cut-off valve of ODU has not been opened to the greatest flow position as required.
2) The system pipeline is blocked.
3) Operating environment condition exceeds the applicable range.
4) Poor design of air flow organization.
5) Insufficient charging volume of refrigerant.