Gree GMVVQ1015WM/C-X, Service Manual

Page: 188 / 433

Gree GMV6 HR DC Inverter VRF Units Service Manual
186
2.123 "L5" Antifreeze Protection
Fault display: wired controller of indoor unit and receiver of indoor unit display
Applicable models: all indoor units
Fault diagnosis:
When the pipe temperature of the indoor unit is too low, the unit will trigger antifreeze protection to
prevent the evaporator from freezing.
Possible causes:
■ The indoor filter and evaporator are dirty;
■ The indoor motor is stuck;
■ Insufficient refrigerant in the unit;
■ The ambient temperature where the indoor unit and outdoor unit operate is too low.
Troubleshooting:
"L5" Antifreeze Protection
Whether th e i ndoor unit
is main tain ed regula rly? Whether
dust accumulates on the fil ter
or evapora tor?
Replace th e motor of ind oor
unit
No
No
Whether the motor of
indoor unit is normal? (In the case of an
AC motor, if the motor slows down or stops
when a fault occurs, it may cause the indoor unit
to exchange heat ineffectively and the
evaporator to freeze)
Clean the indoor uni t
No
When the ambient tempera ture in which the
indo or unit an d the outdoor un it opera te is too
low, the con densing pressure and evapor atin g
pressure would decrease, and the unit is likely to
trigger freezing protectio n. In this case, increase
the fan speed of the ind oor unit
Yes
No
Add refrige rant a ccordin g to
system pa ramete rs
Yes
Whether refrigera nt leaks?
(Lea kin g or insuffi cien t refrigera nt may cause th e
evapor atin g p ressure to decrease and th e e vap orator
to freeze, and trigge r freezing protection of the
indo or unit in serious ca ses)