Troubleshooting - Mitsubishi Electric CITY MULTI PEFY-M140VMA-A1 Operation Manual

6. Troubleshooting

When an error occurs, the following screen will appear and the operation LED will blink.
Check the error status, stop the operation, and consult your dealer.
Before you ask for repair service, check the following points:
State of Machine
It does not run. Ruled line and clock are not
displayed.
No display appears even when
the [ON/OFF] button is pressed.
Air flows out but it does The liquid crystal display shows
not cool enough or heat that it is in the state of operation.
enough.
Cool air or warm air does The liquid crystal display shows
not come out. that it is in operation.
It runs briefly, but soon The "CHECK" and check code
stops. flash on the liquid crystal display.
The sound of the exhaust All lights are out except the ruled
and rotation of the motor line and clock.
can still be heard after
stop of running.
The sound of the exhaust All lights are out except the ruled
and the rotation of the line and clock.
motor can be heard
intermittently after stop of
running.
Warm air comes out The liquid crystal display shows
intermittently when the that it is in the state of operation.
thermostat is OFF or
during fan operation.
• If operation stops due to a power failure, the [restart-preventing circuit at power failure] operates and disables unit operation even after power restoration. In this case,
press the [ON/OFF] button again and start operation.
If malfunctions persist after you have checked the above, turn the power supply OFF and contact your dealer with information about the product name, the nature of the
malfunction, etc. If the display of error information flashes, tell the dealer contents of the display (error code). Never attempt to repair by yourself.
KJ79P970H02
Error code, error unit, refrigerant address, unit model name, and serial number will appear.
The model name and serial number will appear only if the information have been registered.
Press the [F1] or [F2] button to go to the next page.
Remote Controller
Power failure
The power supply is turned OFF.
The fuse in the power supply is gone.
The earth leakage breaker is gone.
Improper temperature adjustment
The filter is filled with dust and dirt.
There are some obstacles at the air inlet
and outlet of the indoor and outdoor units.
Windows and doors are open.
The restart-preventing circuit is in operation
for 3 minutes.
Indoor unit operation was restarted during
the heating and defrosting operation.
There are some obstacles at the air inlet
and outlet of the indoor and outdoor units.
The filter is filled with dust and dirt.
When other indoor units are engaged in
cooling operation, the machine stops after
running a drain-up mechanism for 3
Fri
minutes when air-cooling operation is
stopped.
When other indoor units are engaged in
cooling operation, drained water is brought
in. If the drain water is collected, the
Fri
drain-up mechanism initiates a draining
operation.
When other indoor units are engaged in
heating operation, the control valves are
opened and closed from time to time to
maintain the stability of the system.
Cause
Press the [ON/OFF] button after power restoration.
Turn the power supply ON.
Replace fuse.
Put in the earth leakage breaker.
After checking the set temperature and inlet
temperature on the liquid crystal display, refer to
section 3.3 "Set temperature", and operate the
adjustment button.
Clean up the filter.
(Refer to section 5 "Caring for the machine".)
Remove.
Close.
Wait for a while.
(To protect the compressor, a 3- minute restart-
preventing circuit is built into the indoor unit. Therefore,
there are occasions sometimes when the compressor
does not start running immediately. There are cases
when it does not run for as long as 3 minutes.)
Wait for a while.
(Heating operation starts after ending defrosting
operation.)
Rerun after removal
Rerun after cleaning the filter. (Refer to section 5
"Caring for the machine".)
Wait for 3 minutes.
It soon stops. (If the noise occurs more than 2-3 times
in an hour, ask for repair service.)
It soon stops. (If the room temperature rises
uncomfortably high in a small room, stop operation.)
10
Troubleshooting