Page 34mrcool.com
Maintenance
Problem Time of Occurrence Cause
Mist comes from the
conditioner.
The air conditioner
generates noise.
The air conditioner
generates smells.
Dust comes from the
air conditioner.
During operation.
System switches to heating mode after
defrosting.
The air conditioner is buzzing when
operation begins.
When the unit is turned on, it purrs.
If the unit is running under high
humidity, the wet air in the room will be
quickly cooled down.
Defrosting process will generate some
water, which will turn to vapor.
Temperature control will be buzzing
when it starts working. The noise will
become weak 1 minute later.
When the system has just started, the
refrigerant is not stable. About 30 secs
later, the purr of the unit becomes low.
The unit starts operation after being
unused for a long time.
Dust inside the units come out together
with the air.
During operation.
Smells from the operating environment
may be conducted through the air
handler.
It’s the sound of the 4-way valve
switching direction. The sound will
disappear after the valve is in position.
About 20 secs after the unit rst enables
heating mode or when defrosting under
heating mode.
It’s the sound of gaseous refrigerant that
stops owing and the sound of the
drainage system.
There is a hissing sound when the unit
has started or stopped and a slight
hissing sound during and after operation.
Because refrigerant suddenly stops
owing or changes the ow direction.
There is a hissing sound when the unit is
turned on or suddenly stopped during
operation or after defrosting.
Because of temperature change, the
front panel and other components may
swell and cause an abrasive sound.
There is a crunching sound during and
after operation.
(2) The following situations are not operation failures.
NOTICE
Check the above items and take appropriate corrective measures. If the air conditioner
continues improper function, please turn off the air conditioner immediately and contact
MRCOOL or your installing dealer.
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