Gree GMV6 DC Inverter VRF Units Service Manual
"U8" Ab no rmal P ipes of the
In do or Unit
Po wer on th e u nits base d
on th e capa city an d nu mber of indoor u nits
en ab led previou sly in t he case of pr ot ection sta te. Af ter
con firming th at the EX V co il o f t he indo or u nit is conn ecte d
pro per ly, po wer of f th e u nit. The n, po wer
on to reset the unit and check the
rese tting act ion
No
Replace the expan sion valve coil
or main bo ard
Whet her t he pipe s are clog ge d a s a re sult o f
weldin g f ailur e? W het her t he filter is d irty and whe the r
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" Ab no rmal P ipes of Outd oo r
Unit
Power on the units
based on the capacity an d number of
indoor u nits enabled previously in the case of
protection state. After confirm ing th at the EXV coil of the indoor
unit is connected properly, powe r off the unit. Th en,
powe r on to reset the unit and check
the reset ting action
No
Replace the expan sion valve coil
or main bo ard
Whet her t he pipe s are clog ge d a s a re sult
of welding fa ilure? Whet he r t he filter is d irty and
whether the electronic expansion valve is stuck?
Yes
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