Midea MFA-76CRN1 Technical Manual page 51

R410A Tropical Split Type Technical Manual
If the air conditioner fails and does not meet the above phenomena, check the system as the following table:
Symptoms
Power supply fails.
Power switch is not connected.
The unit does not
Fuse blows out or circuit breaker snaps off.
work
The remote controller or the wire controller
fails.
Air flowing
Temperature setting is improper.
normally but
completely can't
cooling
3-minute protection of compressor.
The system is lack of refrigerant. Or there is
too much refrigerant in the system.
Air or non-condensable gas exists in the
The unit starts or
refrigerant system.
stops frequently
Compressor fails.
The voltage is too high or too low.
The refrigerant pipe is obstructed.
The heat exchanger of outdoor unit or indoor
unit is too dirty.
The filter is too dirty.
Air inlet or air outlet of the indoor/ outdoor
unit is blocked.
Doors or windows of the room are open.
Poor cooling effect
Directly exposed to sunlight.
Too many heat sources in the room.
The outdoor ambient temperature is too
high.
The system is lack of refrigerant.
The outdoor ambient temperature is lower
than -7℃.
Poor heating Doors or windows of the room are not closed
effect tightly.
The system is lack of refrigerant.
Duct Type
Causes Handling methods
Operate after power resumes.
Connect the power supply properly.
Replace the fuse or check whether
electric leakage occurs.
Check the remote controller or wire
controller.
Temperature setting is higher than the
room temperature in cooling mode. Or
temperature setting is lower than the
room temperature in heating mode.
Waiting for 3 minutes.
Fix the leakage places, and charge the
proper quantity of refrigerant.
Vacuum the system and charge
refrigerant again.
Repair or replace the compressor.
Install a voltage regulator.
Locate and replace that part.
Clean the heat exchanger.
Clean the filter.
Remove obstacles to keep well
ventilating.
Close all the windows and doors.
Use curtain to obstruct sunlight.
Reduce the heat sources.
The cooling effect is poor but normal.
Fix the leakage places, and charge the
proper quantity of refrigerant.
Use an assistance heating device.
Close the doors and windows properly.
Fix the leakage places, and charge the
proper quantity of refrigerant.
Troubleshooting
51