Carrier 53KLE Service Maintenance Manual page 28

TROUBLE CHART (Cont.)
TROUBLE
Air conditioner is not supplying
enough cooling.
Air conditioner is not supplying
enough heating.
Green LED is flashing
A slight mist is emitted from the
indoor unit during cooling
A slight whistling noise is heard when
is heard when the air conditioner
starts or stops.
Water vapor (mist) emanating from the
outdoor unit.
Unpleasant smells coming from the
indoor unit.
REASON
Air flow cannot circulate freely
Dirty filters reduce air quantity circulating. Clean air filters
Doors and/or windows are open.
Fan speed has been set to "Low"
Air flow direction is not correct
Selected temperature is higher than the
room temperature in the cooling mode.
Air flow cannot circulate freely
Dirty filters reduce air quantity circulating. Clean air filters
Doors and/or windows are open.
Fan speed has been set to "Low"
Air flow direction is not correct
Selected temperature is Lower than the
room temperature in the heating mode.
System malfunction contact service
center after having made the following
checks:
• Air filters are clean.
• Air circulation is not
obstructed.
• Outdoor unit coil is not
obstructed with a service
reduction of air circulation.
The cool air from the indoor unit is coming
into contact with the room air.
This is due to the refrigerant beginning to
circulate or an adjustment of the
refrigerant pressures.
It is normal in heat pump operation, when
defrost is automatically activated.
Unpleasant smells can be caused by
substances accumulated in the air filters
27
ACTION
Remove obstructions.
Close doors and windows
Set fan speed at high speed.
Adjust airflow direction as per the mode
chosen.
Correct selected temperature.
Remove obstructions.
Close doors and windows
Set fan speed at high speed.
Adjust airflow direction as per the mode
chosen.
Correct selected temperature.
Refer to the installation manual for fault
code reading to be notified to service
center.
Restart air conditioner after having
corrected the faults.
Normal operation
Normal operation
Normal operation
Switch the system OFF and contact an
authorized service center to have the
filters cleaned.
Restart unit in the ventilation (fan only)
mode and open windows to change room
air.