Troubleshooting - Mitsubishi Electric Mr. Slim PM SERIES Manual

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Table Of Contents

Table of Contents

CEILING CASSETTE PM SERIES

A.6.11 TROUBLESHOOTING

Problem

Unit does not cool or heat very well.

Clean the filter.

Frost forms when the outdoor tempera-

The unit stops operating before

arriving at the set temperature in

ture is low and humidity is high. Wait

the heating mode.

for about 10 minutes for the frost to melt.

After one hour of cooling-mode opera-

The air flow direction suddenly

tion with the air flow in a downward di-

changes.

rection, the unit will automatically

change to the "Horizontal air flow" mode.

When the unit is in the heating or de-

frosting mode, it will automatically

change to the "Horizontal air flow mode".

A white mist is expelled from the

This may occur just after the unit is

indoor unit.

turned on when a high level of humid-

ity is present in the room.

The indicators of the remote con-

Turn on the power switch. " · " will be

troller do not light up when oper-

displayed.

ated.

NOTE: After a power cut, the unit will not restart automatically. You will have to restart it by pressing the POWER - ON/OFF button on the remote

controller.

If none of the above apply, turn the main switch off and contact the dealer from whom you bought the air-conditioner, telling him the model name and the nature

of the problem. Do not try to fix the unit yourself.

Wired remote controllers

In any of the following cases, turn off the main power switch and contact your local dealer for service:

• The operation lamp (on the main unit) flashes.

• The switches do not work properly.

• The circuit breaker trips frequently (or the fuse blows frequently).

• Water has accidentally been splashed into the unit.

• Water leaks from the unit.

• Something is accidentally dropped into the air-conditioner.

• An unusual noise is heard during operation.

Wireless remote controllers: The Operating LED blinks.

The following do not indicate any malfunction:

Odours: smells such as tobacco or cosmetic odours may persist after they have been sucked into the unit.

Sound of liquid flowing inside indoor unit: this can occur during or after operation and is simply the sound of refrigerant being circulated inside the unit.

Ticking sound coming from indoor unit: this can occur when cooling or heating has just begun or has just stopped. It is caused by the indoor unit shrinking or

expanding slightly due to the change in temperature.

The message "CENTRALLY CONTROLLED" appearing on the LCD panel: from time to time, this message may come up on the LCD panel. This does not indicate

any malfunction.

A-302

Solution

CENTRALLY CONTROLLED is dis-

played in the remote controller.

The start and stop functions are not avail-

able just after restarting the unit.

"H0" is displayed in the remote control-

ler.

An error code is displayed in the remote