Use and Care Manual

Page 54mrcool.com
Troubleshooting
Issue Possible Causes
Both indoor and outdoor
units make noises
If a low hissing sound is heard during operation, this is normal. It is
caused by refrigerant gas flowing through the system.
If a low hissing sound is heard when the system starts, is defrosting,
or has just stopped running this is normal. The noise is caused by the
refrigerant gas stopping or changing direction.
If a squeaking sound is heard, this can be caused by the normal
expansion and contraction of the plastic and metal parts during
operation because of temperature changes.
Dust is emitted from
either the indoor or
outdoor unit
The unit may accumulate dust during extended periods of not being
used. This dust will be emitted from the system when it is first
turned on. This can be mitigated by covering the unit during long
periods of non-use.
The unit may absorb odors from the environment it operates in
(furniture, cooking, cigarettes, etc.) which will be emitted during
operation.
The unit’s filters have become moldy and should be cleaned.
The fan of the outdoor
unit does not operate
During operation, the fan speed is controlled to optimize product
operation.
The unit emits a bad odor
NOTE: If problem persists, contact a local dealer or your nearest customer service center. Provide them with
a detailed description of the unit malfunction as well as the model number of your unit.
Troubleshooting
Issue Possible Causes
Poor Cooling
Performance
Temperature setting may be higher
than the ambient room temperature.
Lower the temperature setting.
Solution
Should any problems occur, please check the following items before contacting the manufacturer or
service provider.
The heat exchanger in the indoor and
out door unit is dirty.
Clean the heat exchanger.
The air filter is dirty. Remove the filter and clean it
according to the instructions.
The air inlet or outlet of either unit is
blocked.
Turn off the unit, remove the
obstruction and then turn it back on.
Doors and window are open. Ensure that all doors and windows are
closed while operating the unit.
Excessive heat generated by sunlight. Close windows and curtains during
periods of bright sunshine or high heat.
Too many sources of heat in the room
(people, computers, electronics, etc.).
Reduce the amount of heat sources.
Low refrigerant due to leak or
long-term use.
Check for leaks and reseal if necessary.
Then, top off the refrigerant.
Poor Heating
Performance
Cold air is entering through doors and
windows.
Make sure that all doors and windows
are closed during operation.
Low refrigerant due to leak or
long-term use.
Check for leaks and reseal if necessary.
Then, top off the refrigerant.