Haier AB072MRERA Service Manual page 549

21.9.5 Fault checkup
Please check the following when consigning repair service:
Symptoms
• Water flow sound
• Cracking sound
• Terrible smell in outlet
• air
• Flashing operating indicator
All these
are not
problems
• Awaiting indication
• Sound in shutdown indoor unit
or white steam or cold air
• Clicking sound when switching
the air condition on
• Start or stop working
automatically
• Failure to work
Please
make
another
check.
• Bad cooling & heating effects
• When buttons are inflexible actuated;
• When fuse and breaker have been burnt over and over;
• When there are foreign objects and water in the refrigerator;
• When it cannot still be operated after removing the operation of protective unit;
• When other abnormal conditions occur.
Reasons
Water flow sound can be heard when starting operation, during
operation or immediately after stopping operation. When it starts to
work for 2-3 minutes, the sound may become louder, which is the
flowing sound of refrigerant or the draining sound of condensed
water.
During operation, the air conditioner may make the cracking
sound, which is caused from the temperature changes or the slight
dilation of heat exchanger.
The terrible smell, caused from walls, carpet, furniture, clothing,
cigarette and cosmetics, attaches on the conditioner.
When switching it on again after power failure, turn on the manual
power switch and the operating indicator flashes.
It displays the awaiting indication as it fails to perform refrigerating
operation while other indoor units are in heating operation.
When the operator set it to the refrigerating or heating mode and
the operation is opposite to the setting, it displays the awaiting
indication.
To prevent oil and refrigerant from blocking the shutdown indoor
units, refrigerant flows in the short time and make the sounds of
refrigerant flowing. Otherwise, when other indoor units performs
heating operation, white steam may occur; during refrigerating
operation, cold air may appear.
When the conditioner is powered on, the sound is made due to the
resetting of the expansion valve.
Check if it is in the state of Timer-ON and Timer-OFF.
Check if there is a power failure.
Check if the manual power switch is turned off.
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 line control.
Check if air intake port and air outlet port of outdoor units are
blocked.
Check if the door and windows are open.
Check if the filtering screen of 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.
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