Troubleshooting - Carrier 12000 Installationshandbuch

Troubleshooting

SAFETY PRECAUTIONS
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!
Common Issues
The following problems are not a malfunction and in most situations will not require repairs.
Issue Possible Causes
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.
Unit does not turn
Cooling and Heating Models: If the Operation light and PRE-DEF (Pre-heating/ Defrost) indicators
on when pressing
are lit up, the outdoor temperature is too cold and the unit's anti-cold wind is activated in order to
ON/OFF button
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 may change its setting to prevent frost from forming on the unit.
The unit changes
Once the temperature increases, the unit will start operating in the previously selected mode again.
from COOL/HEAT
The set temperature has been reached, at which point the unit turns off the compressor. The unit
mode to FAN mode
will continue operating when the temperature fluctuates again.
The indoor unit In humid regions, a large temperature difference between the room's air and the conditioned air
emits white mist can cause white mist.
Both the indoor and
When the unit restarts in HEAT mode after defrosting, white mist may be emitted due to moisture
outdoor units emit
generated from the defrosting process.
white mist
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
The indoor unit
when the drain pump (optional) is in operation.
makes noises
A squeaking sound may occur after running the unit in HEAT mode due to expansion and
contraction of the unit's plastic parts.
Low hissing sound during operation: This is normal and is caused by refrigerant gas flowing
through both indoor and outdoor units.
Both the indoor unit
Low hissing sound when the system starts, has just stopped running, or is defrosting: This noise is
and outdoor unit
normal and is caused by the refrigerant gas stopping or changing direction.
make noises
Squeaking sound: Normal expansion and contraction of plastic and metal parts caused by
temperature changes during operation can cause squeaking noises.
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