Carrier Harmony 53VMC18A-H Service And Maintenance Manual page 44

TROUBLE CHART (Cont.)
TROUBLE
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.
Strange noises coming from the
indoor unit.
Starting in heating mode for heat
pump systems
REASON
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
Occasionally the indoor unit can emit
some strange short noises during
operation or when it has stopped.
These are generally due to the of
temperature changes on the plastic parts.
If the system starts at low ambient
temperatures, it takes a little while to
reach a comfortable room temperature.
When the system 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.
21
ACTION
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.
Normal operation
Normal operation