Mitsubishi Electronics MSZ12UN User Manual download pdf (Page 25)

WHEN YOU THINK THAT TROUBLE HAS OCCURRED

Question

The air conditioner

cannot be operated

for about 3 minutes

when restarted.

Cracking sound is

heard.

The room smells

strange.

The fan stops

during the DRY

operation.

The sound of water

flowing is heard.

The sound as

burbling is heard.

The room cannot be

cooled sufficiently.

Answer (not a malfunction)

■ This protects the air conditioner according to instruc-

tions from the microprocessor. Please wait.

■ This sound is generated by the expansion/contraction

of the front panel, etc. due to change in temperature.

■ The air conditioner sucks in an odor adhering to the

wall, carpet, furniture, cloth, etc. and blows it out with

the air.

■ In DRY operation, the unit operates using the same

refrigerant circuit as in COOL operation. DRY opera-

tion time has to be reduced in order to lower humidity

without much room temperature decreasing. So the

compressor sometimes stops, and at the same time

the indoor fan stops. This prevents water condensed

on the heat exchanger from evaporating again.

■ This is the sound of refrigerant flowing inside the air

conditioner.

■ This is the sound of condensed water flowing in the

heat exchanger.

■ This is the sound of the heat exchanger defrosting.

■ This sound is heard when the outside air is absorbed

from the drain hose in turning on the range hood or

the ventilation fan and that makes water flowing in the

drain hose spout out.

This sound is also heard when the outside air blows

into the drain hose in case the outside wind is strong.

■ When a ventilation fan or a gas cooker is used in a

room, the cooling load increases, resulting in an in-

sufficient cooling effect.

■ When the outside air temperature is high, the cooling

effect may not be sufficient.

Answer (not a malfunction)

■ This is the switching sound in turning on/off the fan or

the compressor.

■ When the air conditioner is operated in COOL or DRY

mode, if the operation continues with air blowing down

for 1 hour, the direction of the air flow is automatically set

to horizontal to prevent condensed water from dropping.

■ In the heating operation, if the air flow temperature is

too low or when defrosting is being done, the horizon-

tal vane position is automatically set to horizontal.

■ During COOL and DRY operations, pipe or pipe con-

necting sections are cooled and this causes water to

condense.

■ In the heating operation, the defrosting operation makes

water frozen on the outdoor unit melt and drip down.

■ In the heating operation, water condensed on the heat

exchanger drips down.

■ Please wait as the air conditioner is preparing to blow

out warm air.

■ Defrosting of the outdoor unit is being done (Defrost-

ing operation).

Since this is completed in 10 minutes, please wait.

(When the external temperature is too low and humid-

ity is too high, frost is formed.)

■ This is the sound when the flow of refrigerant inside

the air conditioner is switched.

■ These models are equipped with an auto restart func-

tion. When the main power is turned off without stop-

ping the air conditioner with the remote controller and

is turned on again, the air conditioner will start opera-

tion automatically in the same mode as the one set

with the remote controller just before the shutoff of

the main power.

Question

Mechanical sound is

heard from the

indoor unit.

The air flow

direction changes

during operation.

Water leaks from the

outdoor unit.

Air does not blow

out soon in the

heating operation.

The operation is

stopped for about

10 minutes in the

heating operation.

Hissing sound is

sometimes heard.

The air conditioner

starts the operation

only with the main

power turned on,

though you do not op-

erate the unit with the

remote controller.

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Mitsubishi Electronics MSZ12UN User Manual Page 25

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