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6. Troubleshooting
Before you ask for repair service, check the following points:
•
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 “[check]” and (4 digit) check code flashes, tell the dealer contents of the display (check code). Never attempt to repair by yourself.
The following symptoms are not air-conditioner failures:
•
The air blown out from the air-conditioner can sometimes give off odors. This is due to cigarette smoke contained in the air of the room, the smell of cosmetics, the
walls, furniture, etc., absorbed in the air-conditioner.
•
A hissing noise can be heard immediately after the air-conditioner is started or stopped. This is the sound of the refrigeration flowing inside the air-conditioner. This is
normal.
•
The air-conditioner sometimes snaps or clicks at the beginning or end of cooling/heating operation. This is the sound of friction on the front panel and other sections
due to expansion and contraction caused by temperature change. This is normal.
State of Machine
Remote Controller
Cause
Troubleshooting
It does not run.
“
” display is not lit up
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 dis-
play 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 [Room temperature
adjustment], and operate the adjustment Button.
The filter is filled with dust and dirt.
Clean up the filter.
(Refer to [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 dis-
play shows that it is in
operation.
The restart-preventing circuit is in operation for 3 min-
utes.
Wait for a while.
(To protect the compressor, a 3-minute restart-prevent-
ing 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 started anew during the
heating and defrosting operation.
Wait for a while.
(Heating operation starts after ending defrosting opera-
tion.)
It runs briefly, but soon
stops.
The “check” and check
code flashes on the liq-
uid 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 [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 powered display of
“
”.
When other indoor units are engaged in cooling oper-
ation, 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 rota-
tion of the motor can
be heard intermittently
after stop of running.
All lights are out except
the powered display of
“
”.
When other indoor units are engaged in cooling oper-
ation, 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 opera-
tion.
The liquid crystal dis-
play shows that it is in
the state of operation.
When other indoor units are engaged in heating oper-
ation, 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 uncomfort-
ably high in a small room, stop operation.)
