40MBFAQ: Installation Instructions
Manufacturer reserves the right to change, at any time, specifications and designs without notice and without obligations.
17
TROUBLESHOOTING
Common Issues
The issues listed in Table 9 are not malfunctions and in most situations will not require repairs.
Table 9 — 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 the model number.
SAFETY PRECUATIONS
If any of the following conditions occurs, turn off your unit immediately:
The power cord 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
ISSUE POSSIBLE CAUSES
Unit does not turn on when pressing ON/OFF
The unit has a 3-minute 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 illuminated, or the Operation light is illuminated and the LCD screen displays
“dF”, the outdoor temperature is too cold and the unit’s anti-cold wind is activated to defrost
the unit.
The unit changes from COOL mode to FAN mode
The unit may change its setting to prevent frost from forming on the unit. Once the temperature
increases, the unit starts operating in the previously selected mode again.
The set temperature has been reached, at which point the unit turns off the compressor. The
unit continues 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 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 emits 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.
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