Toshiba MMU-AP0071MH Owner'S Manual Download

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English-23

WHEN THE FOLLOWING SYMPTOMS
ARE FOUND

Check the points described below before asking repair servicing.

It is not a failure.

Check again.

Symptom

Outdoor unit

• White misty cold air or

water is out.

• Sometimes, noise “Pushu !” is

heard.

Indoor unit

• “Swish” sound is heard

sometimes.

• Slight “Pishi!” sound is heard.

• Discharge air smells.

• “

” indication is lit.

• Sound or cool air is output

from the stand by indoor unit.

• When power of the air conditioner is turned on,

“Ticktock” sound is heard.

• Fan and louvers of the indoor unit moves when

the unit is not operated.

Operates or stops automatically.

Does not operate.

Air is not cooled or warmed sufficiently.

Cause

• Fan of the outdoor unit stops automatically and performs defrost

operation.

• Solenoid valve works when defrost operation starts or finishes.

• When the operation has started, during the operation, or immediately

after the operation has stopped, a sound such as water flows may be
heard, and the operation sound may become larger for 2 or 3 minutes
immediately after the operation has started. They are flowing sound of
refrigerant or draining sound of dehumidifier.

• This is sound generated when heat exchanger, etc. expand and

contract slightly due to change of temperature.

• Various smell such as one of wall, carpet, clothes, cigarette, or

cosmetics adhere to the air conditioner.

• When cooling operation cannot be performed because another indoor

unit performs heating operation.

• When the manager of the air conditioner has fixed the operation to

COOL or HEAT, and an operation contrary to the setup operation is
performed.

• When fan operation stopped to prevent discharge of hot air.
• Since refrigerant is flowed temporarily to prevent stay of oil or refriger-

ant in the stand by indoor unit, sound of flowing refrigerant, “Kyururu”
or “Shaa” may be heard or white steam when other indoor unit
operates in HEAT mode, and cold air in COOL mode may be blow-out.

• Sound is generated when the expansion valve operates when power

has been turned on.

• Intermittent operation of the fan with louvers open is sometimes

carried out for the refrigerant recovery control of unoperated unit.

• Is the timer “ON” or “OFF”?

• Is it a power failure?
• Is the power switch turned off?
• Is the power fuse or breaker blown?
• Has the protective device operated? (The operation lamp goes on.)
• Is the timer “ON”? (The operation lamp goes on.)
• Are COOL and HEAT selected simultaneously?

(“

” indication is lit on the display of the remote controller.)

• Is the air inlet or air outlet of the outdoor unit obstructed?
• Are any door or window open?
• Is the air filter clogged with dust?
• Is discharge louver of the indoor unit set at appropriate position?
• Is air selection set to “LOW” “MED”, and is the operation mode set to

“FAN”?

• Is the setup temp. the appropriate temperature?
• Are COOL and HEAT selected simultaneously?

(“

” indication is lit on the display of the remote controller.)

CAUTION

If any of the following conditions occur, turn off the main power supply switch and immediately contact the dealer :
• Switch operation does not work properly.
• The main power fuse often blows out, or the circuit breaker is often activated.
• A foreign matter or water fall inside the air conditioner.
• When the air conditioner does not operate even after the cause of the protective device activation has been removed.

(The operation lamp and

on the remote controller are flashing.)

• Any other unusual conditions are observed.

Silent

It’s strange.