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42 HWX / HQX
Troubleshooting
After batteries have been placed into the controller, the display
is not lit:
• Batteries are exhausted or have the wrong polarity; replace
batteries or check polarity.
When pressing the recessed clock adjustment button, hour
figures on display do not flash:
• Recessed button has not been pressed correctly; press with a
round point, avoid exerting strong pressure.
When pressing any button all symbols appear on display:
• Recessed button for time setting is blocked due to excessive
pressure during use. Controller has been irreversibly damaged;
replace with a new one.
When pressing start button, unit does not start and does not
acknowledge signal with a beep:
• Main is switched OFF, switch it to ON.
• Controller batteries are exhausted; replace.
• Controller has not been pointed correctly to the unit receiver; turn
controller off and repeat the operation in the correct direction.
• There are obstacles (curtains, walls, etc.) between the controller
and the unit; repeat the operation after having removed the
obstacles.
• Receiver on unit or the remote controller are under intense sun
radiation; avoid direct sun on the unit, shut curtains or shades.
• Signal transmission is obstructed by severe interference by
electromagnetic field; avoid sending signals when computers or
household appliances (food processors, coffee grinders, etc.) are
operating close by. Cellular or cordless telephones may also
interfere with the control.
When pressing stop button unit does not turn off and does not
acknowledge signal with a beep:
• Controller batteries are exhausted; replace.
• Controller has not been pointed correctly to the unit receiver; turn
controller off and repeat the operation in the correct direction.
• There are obstacles (curtains, walls, etc.) between the controller
and the unit; repeat the operation after having removed the
obstacles.
• Receiver on unit or the remote controller are under intense sun
radiation; avoid direct sun on the unit, shut curtains or shades.
• Signal transmission is obstructed by severe interference by
electromagnetic field; avoid sending signals when computers or
household appliances (food processors, coffee grinders, etc.) are
operating close by. Cellular or cordless telephones may also
interfere with the control.
When pressing stop button the unit acknowledges signal
receipt with a beep, but fan will not stop
and indicator Q
is
on:
• Unit will stop after 30 sec.
When pressing any function button, controller shows the
function requested on the display, but unit does not
acknowledge signal receipt with a beep and does not carry out
the function:
• Controller batteries are exhausted; replace.
• Controller has not been pointed correctly to the unit receiver; turn
controller off and repeat the operation in the correct direction.
• There are obstacles (curtains, walls, etc.) between the controller
and the unit; repeat the operation after having removed the
obstacles.
• Receiver on unit or the remote controller are under intense sun
radiation; avoid direct sun on the unit, shut curtains or shades.
• Signal transmission is obstructed by severe interference by
electromagnetic field; avoid sending signals when computers or
household appliances (food processors, coffee grinders, etc.) are
operating close by. Cellular or cordless telephones may also
interfere with the control.
When pressing any button display will not change:
• The triangle symbol 1
is on, as another signal is being
transmitted; wait for signal 1
to disappear and repeat the
operation.
Air conditioner will not start:
• Main supply switch is OFF; switch to ON.
• Fuses on main switch are burnt out; replace fuses.
• Wait for 3 minutes: protection against frequent compressor cycling
is on if the symbol Q
is lit.
• Selected temperature is higher than the room temperature (or
lower in the heating mode).
Air conditioner is not supplying enough cooling (or heating):
• Air flow cannot circulate freely.
• Dirty filters reduce air quantity circulating.
• Doors and/or windows are open.
• Fan speed has been set to 'low'.
• Air flow direction is not correct.
• Selected temperature is not correct.
A slight mist is emitted from the unit:
• A slight mist, coming out of the unit air outlet, can be sometimes
noticed during cooling operation. This is due to the cool air coming
into contact with the room air.
A slight whistling noise is heard when the air conditioner
starts or stops:
• This is due to the refrigerant beginning to circulate or an
adjustment of the refrigerant pressures.
N indicator is flashing:
System malfunction.
Contact service organization after having made the following
checks:
• Filters are clean.
• Air circulation is not obstructed.
• Outdoor unit coil is not obstructed with a severe reduction of air
circulation.
Restart air conditioner after having corrected the faults.
Water vapour (mist) emanating from the outdoor unit:
• It is normal in heat pump operation, when defrost is automatically
activated.
Unpleasant smells coming from the unit:
• Unpleasant smells can be caused by substances accumulated in the air
filter. Stop unit and clean filters after switching mains supply off.
Restart unit in the ventilation (fan only) mode and open windows
to change room air.
Strange noises coming from the unit:
• Occasionally the unit can emit some strange short noises during
operation or when it has stopped. These are generally due to the
effect of temperature changes on the plastic parts.
Starting in heating mode for heat pump systems:
• If the unit starts at low ambient temperatures, it takes a little while
to reach a comfortable room temperature. When the unit is started
by the remote control, it emits a signal beep, but the louvre does
not swing and the fan does not run until the operating temperature
has been reached. During this period the Q
indicator light is on.
WARNING
(models with electric heater)
• If the manual thermostat trips the circuit, contact your local Carrier
office.
… 11

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