Carrier 53KLE Service Maintenance Manual page 29

TROUBLE CHART (Cont.)
TROUBLE
Strange noises coming from the
indoor unit.
Starting in heating mode for heat
pump systems
REASON
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.
28
ACTION
Normal operation
Normal operation