11
6. Troubleshooting
Before you ask for repair service, check the following points:
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 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 [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 display
shows that it is in opera-
tion.
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 flashes 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 [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
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 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 opera-
tion, 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 op-
eration, 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 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.
• The fan speed changes in spite of not changing the setting. Not to blow out cold air at the beginning of heating operation, the air conditioner automatically adjusts the
fan speed gradually from lower to the set speed. It also adjust its fan speed to protect the fan motor when return air temperature or fan speed excessively rises.
