Troubleshooting Tips - Carrier 42KZL012NS Owner's Manual

Problem
Dust is emitted from
either the indoor or
outdoor unit
The unit emits a
bad odor
The fan of the
outdoor unit
does not operate

Troubleshooting Tips

When troubles occur, please check the following points before contacting a repair company.
Problem Possible Causes
Power failure
The power switch is off
The unit
The fuse is burned out
is not
Remote control batteries are dead
working
The unit's 3-minute protection has
been activated
Temperature setting may be higher
than the ambient room temperature Lower the temperature setting
The heat exchanger on the indoor
or outdoor unit is dirty
The air filter is dirty
Poor cooling
The air inlet or outlet of either unit
performance
is blocked
Doors and windows are open
Excessive heat is generated by
sunlight
Low refrigerant due to leak or
long-term use
There's too much or too little
refrigerant in the system
There is air, incompressible gas or
The unit
foreign material in the refrigeration
starts and
system.
stops
frequently System circuit is blocked
The compressor is broken
The voltage is too high or too low
The outdoor temperature is lower
than 7°C (44.5°F)
Poor heating
Cold air is entering through doors
performance and windows
Low refrigerant due to leak or
long-term use
The unit may accumulate dust during extended periods of non-use, which
will be emitted when the unit is turned on. This can be mitigated by covering
the unit during long periods of inactivity.
The unit may absorb odors from the environment (such as furniture, cooking,
cigarettes, etc.) which will be emitted during operations.
The unit's filters have become moldy and should be cleaned.
During operation, the fan speed is controlled to optimize product operation.
Possible Causes
Solution
Wait for the power to be restored
Turn on the power
Replace the fuse
Replace the remote control batteries
Wait three minutes after restarting the unit
Clean the affected heat exchanger
Remove the filter and clean it according
to instructions
Turn the unit off, remove the obstruction
and turn it back on
Make sure that all doors and windows are
closed while operating the unit
Close windows and curtains during
periods of high heat or bright sunshine
Check for leaks, re-seal if necessary and
top off refrigerant
Check for leaks and recharge the system
with refrigerant
Evacuate and recharge the system with
refrigerant
Determine which circuit is blocked and replace
the malfunctioning piece of equipment
Replace the compressor
Install a manostat to regulate the voltage
Check for leaks and recharge the system
with refrigerant
Make sure that all doors and windows are
closed during use
Check for leaks, re-seal if necessary and
top off refrigerant
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