MCAC-UTSM-201406 Midea R410A Full DC Inverter Split Type Series Technical Manual
50
9.2 Faults of air conditioner and cause
If any of the following exceptions occur, operation of the air conditioner will be immediately
stopped. Turn off the power switch, and check it.
The Run indicator blinks quickly (2 blinks per second.). After turning off the power
switch and then turning it on again, that indicator still blinks quickly. The receiving
function of the remote controller fails, or the start and shutdown operation is abnormal.
The fuse blows out frequently, or the circuit breaker protection occurs frequently.
Foreign substance or moist enters the air conditioner or other exceptions occur.
If the air conditioner fails but does not meet the foregoing phenomena obviously, check the
system in the following procedure:
Operate it after power supply resumes
and connect the power supply properly.
The power switch is not
connected.
The fuse blows out or the circuit
breaker acts.
Replace the fuse or check whether
electric leakage occurs.
The remote controller or wired
controller fails.
Check the remote controller or wired
controller.
The heating effect is
poor.
The outdoor environment
temperature is lower than -7°C.
Use a heating device. The unit cannot
operate normally.
The door or window is not closed
tightly.
Close door and window tightly.
The refrigerant is leaked or
replenishment is deficient.
Detect leak, and fill the refrigerant of a
correct quantity.
The air conditioner
sends air out but
cannot provide cool
air at all.
The setting temperature is
improper.
The setting temperature is lower than
the room’s during the cooling status or
higher during the heating status.
3-minutes protection of the
compressor.
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