40MHH: Owner’s Manual
Manufacturer reserves the right to change, at any time, specifications and designs without notice and without obligations.
17
TROUBLESHOOTING
Refer to Table 3 on page 18 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.
Common Problems
Table 2 — Common Problems
NOTE:
If an issue 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.
INDOOR UNIT
EVERY MONTH
EVERY 6 MONTHS
EVERY YEAR
Clean Air Filter*
Replace Carbon Filter
Change Remote Control Batteries
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†
Problem
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.
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 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 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 the
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 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.
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 button on remote control to restart operation.
