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KJ79K623H01
6. Troubleshooting
When an error occurs, the following screen will appear and the operation LED will blink.
Check the error status, stop the operation, and consult your dealer.
Error code, error unit, refrigerant address, unit model name, and serial number will appear.
The model name and serial number will appear only if the information have been registered.
Press the [F1] or [F2] button to go to the next page.
Before you ask for repair service, check the following points:
State of Machine
Remote Controller
Cause
Troubleshooting
It does not run.
Ruled line and clock are not
displayed.
No display appears even when
the [ON/OFF] button is pressed.
Power failure
Press the [ON/OFF] button after power restoration.
The power supply is turned OFF.
Turn the power supply ON.
The fuse in the power supply is gone.
Replace fuse.
The earth leakage breaker is gone.
Put in the earth leakage breaker.
Air flows out but it does
not cool enough or heat
enough.
The liquid crystal display shows
that it is in the state of operation.
Improper temperature adjustment
After checking the set temperature and inlet
temperature on the liquid crystal display, refer to
section 3.3 "Set temperature", and operate the
adjustment button.
The filter is filled with dust and dirt.
Clean up the filter.
(Refer to section 5 "Caring for the machine".)
There are some obstacles at the air inlet
and outlet of the indoor and outdoor units.
Remove.
Windows and doors are open.
Close.
Cool air or warm air does
not come out.
The liquid crystal display shows
that it is in operation.
The restart-preventing circuit is in operation
for 3 minutes.
Wait for a while.
(To protect the compressor, a 3- minute restart-
preventing circuit is built into the indoor unit. Therefore,
there are occasions sometimes when the compressor
does not start running immediately. There are cases
when it does not run for as long as 3 minutes.)
Indoor unit operation was restarted during
the heating and defrosting operation.
Wait for a while.
(Heating operation starts after ending defrosting
operation.)
It runs briefly, but soon
stops.
The “CHECK” and check code
flash on the liquid crystal display.
There are some obstacles at the air inlet
and outlet of the indoor and outdoor units.
Rerun after removal
The filter is filled with dust and dirt.
Rerun after cleaning the filter. (Refer to section 5
"Caring for the machine".)
The sound of the exhaust
and rotation of the motor
can still be heard after
stop of running.
All lights are out except the ruled
line and clock.
Fri
When other indoor units are engaged in
cooling operation, the machine stops after
running a drain-up mechanism for 3
minutes when air-cooling operation is
stopped.
Wait for 3 minutes.
The sound of the exhaust
and the rotation of the
motor can be heard
intermittently after stop of
running.
All lights are out except the ruled
line and clock.
Fri
When other indoor units are engaged in
cooling operation, drained water is brought
in. If the drain water is collected, the
drain-up mechanism initiates a draining
operation.
It soon stops. (If the noise occurs more than 2-3 times
in an hour, ask for repair service.)
Warm air comes out
intermittently when the
thermostat is OFF or
during fan operation.
The liquid crystal display shows
that it is in the state of operation.
When other indoor units are engaged in
heating operation, the control valves are
opened and closed from time to time to
maintain the stability of the system.
It soon stops. (If the room temperature rises
uncomfortably high in a small room, stop operation.)
• If operation stops due to a power failure, the [restart-preventing circuit at power failure] operates and disables unit operation even after power restoration. In this case,
press the [ON/OFF] button again and start operation.
If malfunctions persist after you have checked the above, turn the power supply OFF and contact your dealer with information about the product name, the nature of the
malfunction, etc. If the display of error information flashes, tell the dealer contents of the display (error code). Never attempt to repair by yourself.
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