Asami AMV6 - Page 155

Gree GMV6 DC Inverter VRF Units Service Manual
153
2.106 "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 the indoor unit
is maintained regularly? Whether
dust accumulates on the filter
or evaporator?
Replace the motor of indoor
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 unit
No
When the ambient temperature in which the
indoor unit and the outdoor unit operate is too
low, the condensing pressure and evaporating
pressure would decrease, and the unit is likely to
trigger freezing protection. In this case, increase
the fan speed of the indoor unit
Yes
No
Add refrigerant according to
system parameters
Yes
Whether refrigerant leaks?
(Leaking or insufficient refrigerant may cause the
evaporating pressure to decrease and the evaporator
to freeze, and trigger freezing protection of the
indoor unit in serious cases)