Gree UM600PH/A-M, Service Manual

Page: 98 / 121

GREE Duct type Ducted Type Split Air-Conditioner Units
98
Error judgment condition and method
：
Detect compressor discharge temperature through
compressor exhaust pipe and the temperature sensor of shell, if the detection value is over 118
℃
, the
system will stop the unit for protection.
Possible reason
：
1) Cut-off valve of ODU is not opened.
2) Operation of electronic expansion valve is abnormal.
3) Outdoor or indoor fan is abnormal.
4) Filter screen or air duct of IDU is blocked (cooling mode).
5) Ambient operation temperature exceeds the operation range.
6) Refrigerant charge is insufficient.
7) System pipeline is blocked.
Troubleshooting
：
1) Step 1: Check and confirm the cut-off valve of ODU gas pipe and liquid pipe is completely
opened;
2) Step 2: Restart the unit, after confirming the coil of IDU/ODU expansion valve is normally
connected, disconnect the power and energize it to check the reset operation. If it is
abnormal, replace the coil or main board; if it is normal, please check the other items;
3) Step 3: Restart the unit and observe if the fan of IDU/ODU is operating normally; if not,
please replace motor or main board;
4) Step 4: If the protection is under cooling mode, please check if the filter screen of IDU is
dirty, blocked or if the resistance of air duct is too big;
5) Step 5: Confirm that if the air return temperature of the unit exceeds the operation
requirement (requirement for cooling mode: external temperature is -5~52
℃
and internal
temperature is 16~32
℃
; requirement for heating mode: external temperature is -20~24
℃
and internal temperature is 16~30
℃
);
6) Step 6: Confirm if the refrigerant charge is added according to design requirement,
insufficient refrigerant will cause protection;
7) Step 7: Restart the unit, confirm if the pipeline or expansion valve is blocked according to
IDU/ODU parameter and cold/heat status of the pipeline (feel with hands).
(28) “F0” poor main board of outdoor unit
Error display: the main board of outdoor unit and indoor unit will display .
Applicable model: all outdoor units.
Error judgment condition and method
：
Check the reading of address chip, memory chip and
clock chip of ODU main board is normal, if not, it can be judged as abnormal.
Possible reason
：
1) The clock chip on the main board is damaged.
2) The memory chip on the main board is damaged.
3) The address chip on the main board is damaged.