Gree GMV6 DC Inverter VRF Units Service Manual
"U4" Refrigerant Loss
Protection
Whether the refrigerant is
added in accordance with the
design requirements?
No
Check and troubleshoot the
leaks of pipes
2.142 "U6" Abnormal Valve Prompt
Fault display: main board of outdoor unit, wired controller of indoor unit and receiver of indoor unit
display
Fault diagnosis:
During commissioning process, determine whether the check valve of the outdoor unit is open by
detecting the unit's parameters by the pressure sensor. If the parameters are abnormal, the unit prompts
you to confirm whether you want to open the check valve again. After confirmation, press SW4 to proceed.
Possible causes:
■ The check valve of the outdoor unit is not open.
Troubleshooting: Reconfirm and open the check valve of the outdoor unit.
2.143 "U8" Abnormal Pipes of the Indoor Unit
Fault display: main board of outdoor unit, wired controller of indoor unit and receiver of indoor unit
display
Fault diagnosis:
During commissioning process, check the temperature of the indoor unit's pipes to determine
whether the pipes are blocked. Any abnormal parameters found would indicate that the unit has the fault.
Possible causes:
■ The electronic expansion valve operates improperly;
■ The indoor unit's pipes are blocked.
Troubleshooting:
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