Carrier Harmony 53VMC18A-H Service And Maintenance Manual page 43

TROUBLE CHART (Cont.)
TROUBLE
When pressing any button, display will
not change
Air conditioner will not start.
Air conditioner is not supplying
enough cooling.
Air conditioner is not supplying
enough heating.
REASON
The triangle symbols 2 ▲is on, as
another signal is being transmitted.
Main supply switch is OFF
Fuses or main switch are blown
Protection against frequent compressor
cycling is ON
Selected temperature is higher than the
room temperature in the cooling mode
(or lower in the heating 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 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.
20
ACTION
Wait for signal 2 ▲ to disappear and
repeat the operation.
Switch to ON
Replace fuses
Wait for 3 minutes.
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.
Remove obstructions.
Close doors and windows
Set fan speed at high speed.
Adjust airflow direction as per the mode
chosen.
Correct selected temperature.