Carrier XCT 7 40VD H-7S Series - Fault Checkup

Symptoms Reasons
Water ow sound
Water ow sound can be heard when starting operation, during operation, or immediately
after stopping operation. When under operation for 2-3 minutes, the sound may become
louder, which is the owing sound of the refrigerant or the draining sound of condensed
water.
Cracking sound
During operation, the air conditioner may make a cracking sound, which is caused by
temperature changes or the slight dilation of the heat exchanger.
Bad smell in outlet air
The bad smell is caused by walls, carpet, furniture, clothing, cigarette smoke, and cos-
metics, that attaches to the conditioner.
Flashing operating indicator
When switching the unit on again after power failure, turn on the manual power switch
and the operating indicator ashes.
Awaiting indication
This happens when the unit fails to perform the refrigerating operation while other indoor
units are in heating operation. When the operator sets it to the refrigerating or heating
mode and the operation is opposite to the setting, it displays the awaiting indication.
Sound when indoor unit is shut-
down; or occurrence of white steam
or cold air
To prevent oil and refrigerant from blocking the shutdown indoor units, refrigerant ows in
the short time and makes the sound of owing refrigerant. Otherwise, when other indoor
unit performs heating operation, white steam may occur; during refrigerating operation,
cold air may appear.
Clicking sound when switching the
air conditioner on
The sound occurs due to the resetting of the expansion valve when the air conditioner is
powered on.
Automatic start or stop Check if the unit is in the state of Timer-ON and Timer-OFF.
Failure to work Check if there is a power failure.
Check if the manual power switch is turned o󰀨.
Check if the supply fuse and breaker are disconnected.
Check if the protective unit is working.
Check if refrigerating and heating functions are selected simultaneously with the awaiting
indication on the line control.
Bad cooling and heating e󰀨ects
Check if the air intake and air outlet ports of the outdoor units are blocked.
Check if the door and windows are open.
Check if the ltering screen of the air cleaner is blocked with sludge or dust.
Check if the setting of wind quantity is at low wind.
Check if the setting of operation is at the Fan Operation state.
Check if the temperature setting is proper.
Fault Checkup
Please check the following when consigning a repair service:
Under the following circumstances, immediately stop the operation, disconnect the manual supply switch, and
contact the after-service personnel:
• When buttons are inexibly actuated;
• When the fuse and the breaker have been burnt;
• When there are foreign objects and water in the refrigerant;
• When other abnormal conditions occur.
Normal Operation Concerns
Please recheck
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