When The Following Symptoms Are Found - Carrier 38VT 188CTST Series Owner's Manual

11

When the following symptoms are found

Check the points described below before asking repair servicing.
Symptom
• "Swish" sound is heard
sometimes.
• Slight clacking sound is heard.
Indoor unit
• Discharge air smells.
• " " indication is lit.
• Sound or cold air are blowing
out from the stopped
indoor unit.
• When power of the air conditioner is turned on,
"Ticktock" sound is heard.
• LCD blurs when it is touched.
• Fan and louvers of the indoor unit moves when
the unit is not operated.
Stops automatically.
Does not operate.
Air is not cooled sufciently.
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.
• Any other unusual conditions are observed.
Cause
• When the operation has started, during the operation, or
immediately after the operation has stopped, a sound such as
water ows may be heard, and the operation sound may become
larger for 2 or 3 minutes immediately after the operation has
started.
They are owing sound of refrigerant or draining sound of
dehumidier.
• 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.
• This display appears on some models.
• Since refrigerant is owed temporarily to prevent stay of oil
or refrigerant in the stand by indoor unit, sound of owing
refrigerant, may be heard sound of owing refrigerant, or cold
air blows out while other indoor units are operating.
• Sound is generated when the expansion valve operates when
power has been turned on.
• LCD may temporarily blur by static electricity.
• Intermittent operation of the fan with louvers open is sometimes
carried out for the refrigerant recovery control of unoperated unit.
• Is the timer "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.)
• 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 lter 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?
• Is outdoor temperature out of operation temperature range?
■
Con rmation and check
If a problem occurs with the air conditioner,
the OFF timer indicator alternately shows the
check code and the indoor UNIT No. in which
the problem occurred.
■
Troubleshooting history and con rmation
You can check the troubleshooting history with the following procedure if a problem occurs with the air conditioner.
(The troubleshooting history records up to 4 incidents.)
You can check it during operation or when operation is stopped.
• If you check the troubleshooting history during OFF timer operation, the OFF timer will be canceled.
Procedure
Press the OFF timer button for over 10 seconds and
the indicators appear as an image indicating the
troubleshooting history mode has been entered.
If [ Service check] is displayed, the mode enters in
the troubleshooting history mode.
1
• [01: Order of troubleshooting history] appears in the
temperature indicator.
• The OFF timer indicator alternately shows the
[check code] and the [indoor UNIT No. ] in which the
problem occurred.
Each time the setting button is pressed, the recorded
troubleshooting history is displayed in sequence.
The troubleshooting history appears in order from [01]
(newest) to [04] (oldest).
2
CAUTION
In the troubleshooting history mode, DO NOT press the
Menu button for over 10 seconds, doing so deletes the
entire troubleshooting history of the indoor unit.
After you have nished checking, press the ON/OFF
button to return to the regular mode.
3
• If the air conditioner is operating, it remains operated
even after the ON/OFF button has been pressed.
To stop its operation, press the ON/OFF button again.
– 14 –
Check code The indoor UNIT No. in
which the problem occurred.
Description of operation
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EN