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MCAC-UTSM-2012--05 R407C MCCU Technical Manual
71
Part 3 Trouble shooting
1. Malfunctions
If any of the following malfunctions occur, stop operation of the air conditioner immediately. Turn off the power
switch, and contact the local after sales service center of manufacturer:
The fuse blows out frequently, or the circuit breaker protection occurs frequently.
Obstacles or water enter the air conditioner.
Condensing water leaks from indoor unit.
Other malfunctions occur.
If the air conditioner fails and does not meet the above phenomena, check the system as the following table:
Symptoms Causes
Handling
methods
The unit does not
work
Power supply fails.
Operate after power resumes.
Power switch is not connected.
Connect the power supply properly.
Fuse blows out or circuit breaker snaps off.
Replace the fuse or check whether
electric leakage occurs.
Air flowing
normally but
completely can’t
cooling
Temperature setting is improper.
Temperature setting is higher than the
room temperature in cooling mode. Or
temperature setting is lower than the
room temperature in heating mode.
3-minute protection of compressor.
Waiting for 3 minutes.
The unit starts or
stops frequently
The system is lack of refrigerant. Or there is too
much refrigerant in the system.
Fix the leakage places, and charge the
proper quantity of refrigerant.
Air or non-condensable gas exists in the
refrigerant system.
Vacuum the system and charge
refrigerant again.
Compressor fails.
Repair or replace the compressor.
The voltage is too high or too low.
Install a voltage regulator.
The refrigerant pipe is obstructed.
Locate and replace that part.
Poor cooling effect
The heat exchanger of outdoor unit or indoor unit
is too dirty.
Clean the heat exchanger.
The filter is too dirty.
Clean the filter.
Air inlet or air outlet of the indoor/ outdoor unit is
blocked.
Remove obstacles to keep well
ventilating.
Doors or windows of the room are open.
Close all the windows and doors.
Directly exposed to sunlight.
Use curtain to obstruct sunlight.
Too many heat sources in the room.
Reduce the heat sources.
The outdoor ambient temperature is too high.
The cooling effect is poor but normal.
The system is lack of refrigerant.
Fix the leakage places, and charge the
proper quantity of refrigerant.
Poor heating
effect
The outdoor ambient temperature is lower than
-10
℃
.
Use an assistance heating device.
Doors or windows of the room are not closed
tightly.
Close the doors and windows properly.
The system is lack of refrigerant.
Fix the leakage places, and charge the
proper quantity of refrigerant.
Summary of Contents for MCCU-10CN2
Page 20: ...R407C MCCU Technical Manual MCAC UTSM 2012 05 20 10 Wiring diagram cooling only 10 1 MCCU 7CN2...
Page 21: ...MCAC UTSM 2012 05 R407C MCCU Technical Manual 21 10 2 MCCU 10CN2...
Page 22: ...R407C MCCU Technical Manual MCAC UTSM 2012 05 22 10 3 MCCU 14CN2...
Page 23: ...MCAC UTSM 2012 05 R407C MCCU Technical Manual 23 10 4 MCCU 16CN2...
Page 24: ...R407C MCCU Technical Manual MCAC UTSM 2012 05 24 10 5 MCCU 22CN2...
Page 25: ...MCAC UTSM 2012 05 R407C MCCU Technical Manual 25 10 6 MCCU 28CN2...
Page 27: ...MCAC UTSM 2012 05 R407C MCCU Technical Manual 27 10 8 MCCU 45CN2...
Page 28: ...R407C MCCU Technical Manual MCAC UTSM 2012 05 28 Cooling and heating 10 9MCCU 7HN2...
Page 29: ...MCAC UTSM 2012 05 R407C MCCU Technical Manual 29 10 10 MCCU 10HN2...
Page 30: ...R407C MCCU Technical Manual MCAC UTSM 2012 05 30 10 11 MCCU 14HN2...
Page 31: ...MCAC UTSM 2012 05 R407C MCCU Technical Manual 31 10 12 MCCU 16HN2...
Page 32: ...R407C MCCU Technical Manual MCAC UTSM 2012 05 32 10 13 MCCU 22HN2...
Page 33: ...MCAC UTSM 2012 05 R407C MCCU Technical Manual 33 10 14 MCCU 28HN2...
Page 35: ...MCAC UTSM 2012 05 R407C MCCU Technical Manual 35 10 16 MCCU 45HN2...
Page 40: ...R40 11 5 7C CCU Tech 5MCCU 22C hnical Manua CN1 al MCAC C UTSM 201 12 05 40...
Page 42: ...R40 11 6 7C CCU Tech 6MCCU 28C hnical Manua CN1 al MCAC C UTSM 201 12 05 42...
Page 44: ...R40 11 7 7C CCU Tech 7MCCU 35C hnical Manua CN2 al MCAC C UTSM 201 12 05 44...
Page 46: ...R40 11 8 7C CCU Tech 8MCCU 45C hnical Manua CN2 al MCAC C UTSM 201 12 05 46...
Page 52: ...R40 11 1 7C CCU Tech 13 MCCU hnical Manua U 22HN2 MC al CCU 28HN2 2 MCAC C UTSM 201 12 05 52...
Page 54: ...R40 11 1 7C CCU Tech 14 MCCU hnical Manua U 35HN2 al MCAC C UTSM 201 12 05 54...
Page 56: ...R40 11 1 7C CCU Tech 15 MCCU hnical Manua U 45HN2 al MCAC C UTSM 201 12 05 56...