Toshiba MMU-P0121H Service Manual page 19

3-2-6. When the Following Symptoms are Found
Check the points described below before asking repair servicing.
Symptom
Outdoor unit
Indoor unit
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.
• White misty cold air • Fan of the outdoor unit stops automatically and performs defrost
or water is out.
• Sometimes, noise • Solenoid valve works when defrost operation starts or finishes.
"Pushu !" is heard.
• "Swish" sound is • When the operation has started, during the operation, or immedi-
heard sometimes.
• Slight "Pishi!" sound • This is sound generated when heat exchanger, etc. expand and
is heard.
• Discharge air smells. • Various smell such as one of wall, carpet, clothes, cigarette, or
• The operation lamp • Flashes when power is turned on again after power failure, or
flashes
• "STANDBY" • When cooling operation cannot be performed because another
indication is lit.
• When the manager of the air conditioner has fixed the operation to
• When fan operation stopped to prevent discharge of hot air.
• Sound or cool air is • Since refrigerant is flowed temporarily to prevent stay of oil or
output from the
stand by indoor unit.
• When power of the • Sound is generated when the expansion valve operates when
air conditioner is
turned on, "Ticktock"
sound is heard.
• 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?
• 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
• Is the setup temp. the appropriate temperature?
• Are COOL and HEAT selected simultaneously?
operation.
ately 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.
contract slightly due to change of temperature.
cosmetics adhere to the air conditioner.
when power switch is turned on.
indoor unit performs heating operation.
COOL or HEAT, and an operation contrary to the setup operation
is performed.
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.
power has been turned on.
("STANDBY" indication is lit on the display column of the remote
controller.)
to "FAN"?
("STANDBY" indication is lit on the display column of the remote
controller.)
3-16
Cause