Gree GMV6 DC Inverter VRF Units Service Manual
2.98 "J7" Four-way Valve Air Backflow Protection
Fault display: main board of outdoor unit, wired controller of indoor unit and receiver of indoor unit
display
Fault diagnosis:
When the difference between the system high pressure and low pressure during operation detected
by the pressure sensor is less than 0.1 MPa, the unit will stop running to ensure safe operation.
Possible causes:
■ The coil or connecting wire is abnormal;
■ The main board is abnormal;
■ The four-way valve is abnormal.
Troubleshooting:
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