Carrier 42QH30-H Service Maintenance Manual page 21

TROUBLE CHART (Cont.)
TROUBLE
When pressing stop button, unit does
not acknowledge signal with a beep.
When pressing any function button,
the remote control shows the function
requested on the display, but unit
does not acknowledge signal receipt
with a beep and does not carry out the
function.
Air conditioner will not start.
Air conditioner is not supplying
enough cooling.
REASON
Remote control batteries are exhausted.
Remote control has not been pointed
correctly to the receiver of indoor unit.
There are obstacles (curtains, walls, etc.)
between the remote control and the
indoor unit
Receiver on the indoor unit or the remote
control is under intense sun radiation.
Signal transmission is obstructed by
severe interference from an
electromagnetic field.
Main switch is OFF.
Remote control batteries are exhausted.
Remote control has not been pointed
correctly to the receiver of indoor unit.
There are obstacles (curtains, walls, etc.)
between the remote control and the
indoor unit
Receiver on the indoor unit or the remote
control is under intense sum radiation.
Signal transmission is obstructed by
severe interference from an
electromagnetic field.
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.
20
ACTION
Replace batteries.
Turn remote control OFF and repeat the
operation in the correct direction.
Repeat the operation after having removed
the obstacles.
Avoid direct sun on the unit, shut curtains or
shades.
Avoid sending signals when computers or
household appliances (Food processors,
coffee makers, etc.) are operating close by
cellular or cordless telephones may also
interfere with the control.
Switch it to ON position.
Replace batteries.
Turn remote control OFF and repeat the
operation in the correct direction.
Repeat the operation after having removed
the obstacles.
Avoid direct sun on the unit, shut curtains or
shades.
Avoid sending signals when computers or
household appliances (Food processors,
coffee makers, etc.) are operating close by
cellular or cordless telephones may also
interfere with the control.
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.