Mitsubishi Electric PEFY-P140VMH-E [10/15] Troubleshooting

Mitsubishi Electric PLFY-P100VLMD [10/15] Troubleshooting

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6. Troubleshooting

Before you ask for repair service, check the following points:

State of Machine

It does not run.

Air flows out but it does

not cool enough or heat

enough.

Cool air or warm air

does not come out.

It runs briefly, but soon

stops.

The sound of the ex-

haust and rotation of

the motor can still be

heard after stop of run-

ning.

The sound of the ex-

haust and the rotation

of the motor can be

heard intermittently af-

ter stop of running.

Warm air comes out in-

termittently when the

thermostat is OFF or

during fan operation.

Troubleshooting

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 [Room temperature

adjustment], and operate the adjustment button.

Clean up the filter.

(Refer to [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 occa-

sions sometimes when the compressor does not start run-

ning 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 [Caring for the ma-

chine].)

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.)

Cause

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 min-

utes.

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 opera-

tion, the machine stops after running a drain-up mecha-

nism for 3 minutes when air-cooling operation is

stopped.

When other indoor units are engaged in cooling opera-

tion, drained water is brought in. If the drain water is

collected, the drain-up mechanism initiates a draining

operation.

When other indoor units are engaged in heating op-

eration, the control valves are opened and closed from

time to time to maintain the stability of the system.

Remote Controller

“'” display is not lit up.

No display appears even

when the [ON/OFF] but-

ton is pressed.

The liquid crystal display

shows that it is in the

state of operation.

The liquid crystal display

shows that it is in opera-

tion.

The “CHECK” and check

code flashes on the liquid

crystal display.

All lights are out except

the powered display of

“'”.

All lights are out except

the powered display of

“'”.

The liquid crystal display

shows that it is in the

state of 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 “[CHECK]” and (4 digit) check code flashes, tell the dealer contents of the display (check code). Never attempt to repair by yourself.

The following symptoms are not air conditioner failures:

• The air blown out from the air conditioner can sometimes give off odors. This is due to cigarette smoke contained in the air of the room, the smell of cosmetics, the walls,

furniture, etc., absorbed in the air conditioner.

• A hissing noise can be heard immediately after the air conditioner is started or stopped. This is the sound of the refrigeration flowing inside the air conditioner. This is

normal.

• The air conditioner sometimes snaps or clicks at the beginning or end of cooling/heating operation. This is the sound of friction on the front panel and other sections due

to expansion and contraction caused by temperature change. This is normal.

WT04883X02_en.p65 07.8.21, 9:06 AM14

Mitsubishi Electric PEFY-P140VMH-E [10/15] Troubleshooting

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