45MUAAQ: Owner’s Manual
Manufacturer reserves the right to change, at any time, specifications and designs without notice and without obligations.
18
TROUBLESHOOTING
Table 5 — Common Issues
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 your model number.
Issue Possible Causes
Unit does not turn on when
pressing ON/OFF button
The Unit has a 3-minutes protection feature that prevents the unit from overloading. The unit cannot be restarted within three minutes of
being turned off.
Cooling and Heating Models: If the Operation light and PRE-DEF (Pre-heating/Defrost) indicators are lit up, the outdoor temperature is too
cold and the unit’s anti-cold wind is activated in order to defrost the unit.
In Cooling-only Models: If the “Fan Only” indicator is lit up, the outdoor temperature is too cold and the unit’s anti-freeze protection is
activated in order to defrost the unit.
The unit changes from COOL/
HEAT mode to FAN mode
The unit may change its setting to prevent frost from forming on the unit. Once the temperature increases, the unit will start operating in the
previously selected mode again.
The set temperature has been reached, at which point the unit turns off the compressor. The unit will continue operating when the
temperature fluctuates again.
The indoor unit emits white mist In humid regions, a large temperature difference between the room’s air and the conditioned air can cause white mist.
Both the indoor and outdoor units
emit white mist
When the unit restarts in HEAT mode after defrosting, white mist may be emitted due to moisture generated from the defrosting process.
The indoor unit makes noises
A rushing air sound may occur when the louver resets its position.
A squeaking sound is heard when the system is OFF or in COOL mode. The noise is also heard when the drain pump (optional) is in
operation.
A squeaking sound may occur after running the unit in HEAT mode due to expansion and contraction of the unit’s plastic parts.
Both the indoor unit and outdoor
unit make noises
Low hissing sound during operation: This is normal and is caused by refrigerant gas flowing through both indoor and outdoor units.
Low hissing sound when the system starts, has just stopped running, or is defrosting: This noise is normal and is caused by the refrigerant
gas stopping or changing direction.
Squeaking sound: Normal expansion and contraction of plastic and metal parts caused by temperature changes during operation can
cause squeaking noises.
The outdoor unit makes noises The unit will make different sounds based on its current operating mode.
Dust is emitted from either the
indoor or outdoor unit
The unit may accumulate dust during extended periods of non-use, which will be emitted when the unit is turned on. This can be mitigated
by covering the unit during long periods of inactivity.
The unit emits a bad odor
The unit may absorb odors from the environment (such as furniture, cooking, cigarettes, etc.) which will be emitted during operations.
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.
Leak Detection
Leak Detection System installed. Unit must be powered except for service. For the unit with refrigerant sensor, when the refrigerant
sensor detects refrigerant leakage, the indoor unit will display a error code and emit a buzzing sound, the compressor of outdoor unit will
immediately stop, and the indoor fan will start running. The service life of the refrigerant sensor is 15 years. When the refrigerant sensor
malfunctions, the indoor unit will display the error code FHCC. The refrigerant sensor can not be repaired and can only be replaced by the
manufacture. It shall only be replaced with the sensor specified by the manufacture.
If any of the following conditions occurs, turn off your unit
immediately.
• The field wiring cable is damaged or abnormally warm
• You smell a burning odor
• The unit emits loud or abnormal sounds
• A power fuse blows or the circuit breaker frequently trips
• Water or other objects fall into or out of the unit
DO NOT ATTEMPT TO FIX THESE YOURSELF. CONTACT
AN AUTHORIZED SERVICE PROVIDER IMMEDIATELY.
CAUTION
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