When The Following Symptoms Are Found - Toshiba Super MMU-AP0091H Service Manual

3-17. When the Following Symptoms are Found

Check the points described below before asking repair servicing.
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.
• The operation lamp
flashes
• "STANDBY"
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.
Operates or stops automatically.
Does not operate.
Air is not cooled or warmed sufficiently.
When the following symptoms are found, stop the operation immediately, turn off the power switch, and contact
the dealer which you have purchased the air conditioner.
• Activation of switch is unstable.
• Fuse or breaker is blown periodically.
• Foreign matters or water entered by mistake.
• When if activation cause of the protective device has been removed, the operation is not performed.
• Other unusual status occurred.
• 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.
• Flashes when power is turned on again after power failure, or when
power switch is turned on.
• 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
refrigerant 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.
• 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? ("STANDBY" indica-
tion is lit on the display column of the remote controller.)
• Is the suction port or discharge port 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?
It's strange.
• 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? ("STANDBY" indica-
tion is lit on the display column of the remote controller.)
Cause
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