Gree UM600PH/A-M, Service Manual

Page: 94 / 121

GREE Duct type Ducted Type Split Air-Conditioner Units
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(24) “dC” Capacity DIP switch setting error
Error display: wired controller of IDU and the dash receiver of IDU will display .
Error judgment condition and method:
If capacity DIP switch is set to the wrong position, report the error.
Possible reason
：
1) Capacity DIP switch is set to the wrong position.
2) Detecting circuit is abnormal.
(25) “db” Project debugging
Error display: ODU mainboard, IDU displays .
Error judgment condition and method: This is a status code of project debugging, not a error
code. When IDU or ODU displays this code, it means the unit is under debugging status and the IDU
cannot be operated.
Troubleshooting: ——
Possible reason
：
——
(26) “E1” high pressure protection
Error display:
ODU mainboard, IDU displays .
Applicable model:
all models.
Error judgment condition and method
：
Judge through detecting the real-time high pressure or the
high pressure switch. If the sensor detects that the high pressure value is over 65
℃
or the high pressure
switch is disconnected, then it is judged as high pressure, the system will stop the unit for protection.
Possible reason
：
1) Cut-off valve of ODU is not opened;
2) High pressure switch operation is abnormal;
3) Outdoor or indoor fan is abnormal;
4) Filter screen of IDU or air duct is blocked (heating mode);
5) Ambient operation temperature is too high;
6) Refrigerant charging of the system is too much;
7) System pipeline is blocked;