Troubleshooting - Toshiba MMY-MAP0726HT6P-UL Owner's Manual

12

Troubleshooting

Check the points described below before asking repair servicing.
Symptom
• White misty cold air or • Fan of the outdoor unit stops automatically and performs defrost
water is out.
Outdoor unit
• Sometimes, hiss sound • Solenoid valve works when defrost operation starts or finishes.
is heard.
• "Swish" sound is heard • When the operation has started, during the operation, or immediately
sometimes.
• Slight clacking sound • This is sound generated when heat exchanger, etc. expand and contract
is heard.
• Discharge air smells. • Various smell such as one of wall, carpet, clothes, cigarette, or
• When cooling operation cannot be performed because another indoor
• " " indication is lit.
Indoor unit
• Is outdoor temperature out of operation temperature range?
• When the manager of the air conditioner has fixed the operation to
• " " indication is lit.
• " " indication is lit. • When stopping the fan to prevent cool air blow at starting heating.
• Sound or cool air is • Since refrigerant is flowed temporarily to prevent stay of oil or refrigerant
output from the stand
by indoor unit.
• When power of the air conditioner is • Sound is generated when the expansion valve operates when power has
turned on, "Ticktock" sound is heard.
• LCD blurs when it is touched. • LCD may temporarily blur by static electricity.
• Fan and louvers of the indoor unit • Intermittent operation of the fan with louvers open is sometimes carried
moves when the unit is not operated.
Operates or stops automatically. • 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.)
Does not operate.
• Is the timer "ON"? (The operation lamp goes on.)
• Are COOL and HEAT selected simultaneously?
• Is outdoor temperature out of operation temperature range?
• Is the air intake or air discharge 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
Air is not cooled or warmed sufficiently.
• Is the setup temp. the appropriate temperature?
• Are COOL and HEAT selected simultaneously?
• Is outdoor temperature out of operation temperature range?
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Cause
operation.
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.
slightly due to change of temperature.
cosmetics adhere to the air conditioner.
unit performs heating operation.
COOL or HEAT, and an operation contrary to the setup operation is
performed.
in the stand by indoor unit, sound of flowing 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.
been turned on.
out for the refrigerant recovery control of unoperated unit.
(" " indication is lit on the display of the remote control.)
"FAN"?
(" " indication is lit on the display of the remote control.)
– 17 –
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 control are fl ashing. When
or and a number are displayed on the remote control, also inform a qualifi ed service person of the display
content.)
• Any other unusual conditions are observed.
Confirmation and check
When a problem occurred in the air conditioner, the check code
and the indoor unit No. appear on the display part of the remote
control.
The check code is only displayed during the operation.
If the display disappears, operate the air conditioner according
to the following "Confirmation of check code log" for confirmation.
Confirmation of check code log
When a problem occurred on the air conditioner, the check
code log can be confirmed with the following procedure. (The
check code log is stored in memory up to 4 check codes.)
The log can be confirmed from both operating status and
stop status.
Procedure
When and buttons are pushed simultaneously for 4
seconds or more, the following display appears.
If [ Service check] is displayed, the mode enters in the check
1
code log mode.
• [01: Order of check code log] is displayed in CODE No. window.
• [Check code] is displayed.
• [Indoor unit address in which a problem occurred] is displayed
in UNIT No..
Every pushing of [ / ] button used to set temperature, the check code log stored in memory is
displayed in order.
2
The numbers in CODE No. indicate CODE No. [01] (latest) to [04] (oldest).
CAUTION
Do not push button because all the check code log of the indoor unit will be deleted.
3
After confirmation, push button to return to the usual display.
1. Check the check codes according to the above procedure.
2. Ask an authorized dealer or qualified service (maintenance) professional to repair or maintain the air
conditioner.
3. More details of the check code are explained in Service Manual.
and a combination of , , , ,
Indoor unit No. in which
Check code
a problem occurred
TEMP. ON / OFF
2
TIMER SET FAN MODE
TIME SAVE A A VENT
FILTER L L
RESET TEST SET CL SWING/FIX UNIT LOUVER
3 1
Description
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