Gree CF01000730, Service Manual

Page: 100 / 129

GREE Duct type split Air conditioner Inverter Series
98
Troubleshooting
：
Yes
“F5” discharge
temperature sensor error
of compressor 1
Re-insert it after proper
treatment
The detected circuit might
be abnormal
Yes
Replace the main control
board
No
Check the wiring terminal of the main board
and temperature sensor to see if it’s loose or
are there any foreign objects
No
Replace the temperature sensor
(30) “J7” air-mixing protection for 4-way valve
Error display: the main board of outdoor unit and indoor unit will display .
Applicable model: heat pump models.
Error judgment condition and method
：
Detect system high and low pressure through pressure
sensor, start the unit, when the pressure difference of high and low pressure is less than 0.1MPa, the unit
will be stopped for protection.
Possible reason
：
1) Coil or connection wire is abnormal.
2) The main board is abnormal.
3) The internal of 4-way valve is abnormal.