Carrier 45MBDAQ - Troubleshooting

45MBDAQ: Owner’s Manual
Manufacturer reserves the right to change, at any time, specifications and designs without notice and without obligations.
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TROUBLESHOOTING
The issues in Table 2 are not malfunctions and in most cased do not require repairs.
Table 2 — Common Issues
NOTE: If an issue persists, contact a local dealer or your nearest customer service center. Provide them with a detailed description of the
unit’s malfunction as well as the unit’s model number.
SAFETY PRECAUTIONS
If any of the following conditions occur, turn off the 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 issues yourself. Contact an
authorized service provider immediately!
WA RN IN G
ISSUE POSSIBLE CAUSES
Unit does not turn on when
user presses ON/OFF
The unit has a 3-minute protection feature that prevents the unit from overloading. The unit cannot be
restarted within three minutes after 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
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 the HEAT mode (after defrosting), white mist may be emit 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 the 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
the 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 the current operating mode.