40MPHB: Owner’s Manual
Manufacturer reserves the right to change, at any time, specifications and designs without notice and without obligations.
14
TROUBLESHOOTING (CONT)
Refer to Table 1 before contacting your local dealer.
Table 1 — Periodic Maintenance
* Increase frequency in dusty zones.
†
Maintenance to be carried out by qualified service personnel. Refer to the Installation Manual
The following problems are not a malfunction and in most situations will not require repairs.
Table 2 — Common Issues
INDOOR UNIT
EVERY MONTH
EVERY 6 MONTHS
EVERY YEAR
Clean Air Filter*
Replace Carbon Filter
Change Remote Control Batteries (as needed)
OUTDOOR UNIT
EVERY MONTH
EVERY 6 MONTHS
EVERY YEAR
Clean Outdoor Coil from Outside
Clean Outdoor Coil from Inside†
Blow Air Over Electric Parts†
Check Electric Connection Tightening†
Clean Fan Wheel†
Check Fan Tightening†
Clean Drain Pans†
ISSUE
POSSIBLE CAUSE
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 restart within three minutes of being turned off.
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.
The set temperature has been reached, at which point the unit turns off the compressor.
The unit will continue operating once 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 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 makes 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 outdoor unit fan does not operate
During operation, the fan speed is controlled to optimize product operation.
Operation is erratic,
unpredictable, or unit
is unresponsive
Interference from cell phone towers and remote boosters may cause the unit to
malfunction.
In this case, try the following:
• Disconnect the power, then reconnect.
• Press
ON/OFF
on the remote control to restart the operation.
