Carrier 42QTD036R8S [13/21] Troubleshooting

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Troubleshooting

CAUTIONS

If one of the following conditions occurs, switch o the power supply immediately and

contact your dealer for further assistance.

• The operation light continues to ﬂash rapidly after the unit has been restarted.

• The remote control buttons do not work.

• The unit continually trips fuses or circuit breakers.

• A foreign object or water enters the air conditioner.

• Other abnormal situations.

Common Problems

The following symptoms are not a malfunction and in most situations will not require repairs.

Problem Possible Causes

Unit does not

turn on when

pressing ON/

OFF button

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 o.

Cooling and Heating Models: If the Operation light and PRE-DEF (Pre-heating/

Defrost) indicators are lit up, the outdoor temperature is too cold and the unit’s

anti-cold wind is activated in order to 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 changes

from COOL mode

to FAN mode

The unit changes its setting to prevent frost from forming on the unit. Once

the temperature increases, the unit will start operating again.

The set temperature has been reached, at which point the unit turns o the

compressor. The unit will resume operating when the temperature ﬂuctuates

again.

The indoor unit

emits white mist

In humid regions, a large temperature dierence between the room’s air and

the conditioned air can cause white mist.

Troubleshooting