Faults Of Air Conditioner And Cause - Midea MTA1-76HR Technical Manual

MCAC-RTSM-201301-01

Shift from cooling mode to air supply mode.

In order to prevent frosting of the indoor heat exchanger, the air conditioner shifts to air
supply mode automatically, and resumes to cooling mode in a short time.

When the room temperature decreases to the set temperature, the air conditioner will shut
down the compressor automatically, and shifts to the air supply status. After the room
temperature rises, the compressor will restart. The action of the compressor in the heating
mode is the contrary.

4.2 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:
Symptom
The system does
not run.
Symptom
The heating effect is
poor.
Symptom
The air conditioner
sends air out but
cannot provide cool
air at all.
Possible causes
Power supply fails.
The power switch is not
connected.
The fuse blows out or the circuit
breaker acts.
The remote controller or wired
controller fails.
Possible causes
The outdoor environment
temperature is lower than -7° C.
The door or window is not closed
tightly.
The refrigerant is leaked or
replenishment is deficient.
Possible causes
The setting temperature is
improper.
3-minutes protection of the
compressor.
Midea R22 T1 side-discharge duct manual
Way of handing
Operate it after power supply resumes
and connect the power supply properly.
Replace the fuse or check whether
electric leakage occurs.
Check the remote controller or wired
controller.
Way of handing
Use a heating device. The unit cannot
operate normally.
Close door and window tightly.
Detect leak, and fill the refrigerant of a
correct quantity.
Way of handing
The setting temperature is lower than
the room's during the cooling status or
higher during the heating status.
Waiting for 3 minutes.
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