Gree GMV6 DC Inverter VRF Units Service Manual
"U8" Abnormal Pipes of the
Indoor Unit
Power on the units based
on the capacity and number of indoor units
enabled previously in t he case of prot ection state. After
confirming that the EXV coil of t he indoor unit is connected
properly, power of f the unit. Then, power
on to reset the unit and check the
resetting act ion
No
Replace the expansion valve coil
or main board
Whether the pipes are clogged as a result of
welding f ailure? Whether the filter is dirty and whether
the electronic expansion valve is stuck?
Yes
2.144 "U9" Abnormal Pipes of Outdoor 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 pressure of the unit to determine whether the pipes of the
outdoor unit are blocked. Any abnormal parameters found would indicate that the unit has the fault.
Possible causes:
■ The electronic expansion valve operates improperly;
■ The outdoor unit's pipes are blocked.
Troubleshooting:
"U9" Abnormal Pipes of Outdoor
Unit
Power on the units
based on the capacity and number of
indoor units enabled previously in the case of
protection state. After confirming that the EXV coil of the indoor
unit is connected properly, power off the unit. Th en,
power on to reset the unit and check
the resetting action
No
Replace the expansion valve coil
or main board
Whether the pipes are clogged as a result
of welding failure? Whether the filter is dirty and
whether the electronic expansion valve is stuck?
Yes
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