Troubleshooting - Toshiba Carrier MMD-UP0481HFP-UL Owner's Manual

Cleaning the indoor unit and
remote controller
Ask qualifi ed service person to clean the indoor units
for the models listed in the warning on the top of this
chapter.
Wipe with a dry, soft cloth.
Do not use benzine, thinner, scouring powder,
chemical cloth, etc. as those may cause deformation
or breakage.
If unused for over a month
Leave the fan on for half a day or so to dry the inside.
Turn off the main power switch.
Clean the air fi lter and then attach it.
Periodic inspection
After being used for a long period of time, the parts
may deteriorate or malfunction, or the drainage
may worsen, due to heat, moisture, dust, or general
usage.
In addition to the maintenance, it is recommended
that you have a inspection (charges apply) performed
by the dealer where you purchased the unit, etc.
Before the cooling / heating
season
Ask a qualifi ed service person to clean the drain
pan.
CAUTION
Clean the drain pan
Without cleaning, the drain pan may be fi lled with
waste, and water may overfl ow onto the ceiling or fl oor.
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9

Troubleshooting

When the following symptoms are found, check the points described below before asking repair servicing.
S y m p o t m
White misty cold air or water
is out.
Outdoor unit
Sometimes, noise of air leak
is heard.
"Swish" sound is heard
sometimes.
Slight clacking sound is
heard.
" " indication is lit.
Indoor unit
" " indication is lit.
" " 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.
LCD blurs when it is touched.
S o t p s a u o t m a c i t l a . y l
Does not operate.
If only fan operation is performed
C a u s e
Fan of the outdoor unit stops automatically and performs
defrost operation.
Solenoid valve works when defrost operation starts or
fi nishes.
When the operation has started, during the operation, or
immediately after the operation has stopped, a sound such
as water fl ows may be heard, and the operation sound
may become larger for 2 or 3 minutes immediately after the
operation has started. They are fl owing sound of refrigerant
or draining sound of dehumidifi er.
This is sound generated when heat exchanger, etc. expand
and contract slightly due to change of temperature.
When cooling operation cannot be performed because
another indoor unit performs heating operation.
Is outdoor/suction temperature out of operation temperature
range?
When the manager of the air conditioner has fi xed the
operation to COOL or HEAT, and an operation contray to the
setup operation is performed.
When stopping the fan to prevent cool air blow at starting
heating.
Since refrigerant is fl owed temporarily to prevent stay of oil
or refrigerant in the stand by indoor unit, sound of fl owing
refrigerant, 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.
LCD may temporarily blur by static electricity.
s I h t e i t m e " r O F F ? "
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 outdoor/suction air temperature outside of operating
temperature range? The operation is automatically stopped
(" "on the remote controller display turms on).
Is the outdoor/suction air temperature outside of operating
temperature range for cooling and heating? The operation is
automatically switched to the fan mode.
22-EN