37
11. TROUBLESHOOTING
■
Note before beginning inspection/repair
●
After checking the self-diagnostic monitor, disconnect main power before beginning inspection and repair.
●
After the inspection/repair, erase the contents of the self-diagnostic monitor by setting the operation selector
on the indoor unit to DEMO and then main power back in the power supply.
11-1. Operating State
Dry
operation
Indoor fan sometimes stops.
It makes a strange sound.
It smells during operation.
Air conditioner does not operate.
Customer Description
Explanation
Others
●
Based on the room temperature, the indoor fan and outdoor unit repeat the processes
of Operation and Stop.
●
When room temperature is below the set temperature, the indoor fan either slows
down to low speed or stops.
●
Flap motor positions the air flap by operating for 10 to 20 seconds after start-up and
operation stop.
●
When plugged in and operation button is pressed immediately, the outdoor unit will not
operate for about 3 minutes.
●
When restarted immediately after being stopped, the outdoor unit will not operate for
about 3 minutes.
Both are for preventing malfunctions.
●
You may hear sound similar to water flowing just after operation is started, during
operation, or after the system is stopped. This is the sound of refrigerant gas flowing
and is not a problem.
●
When operation is started or after it is stopped, you may hear some small sounds.
These are caused by switches or expansion / contraction of parts (heat exchanger /
plastic parts) inside the air conditioner due to changes in temperature.
●
Smells permeating walls, carpets, furniture, or clothes may become noticeable.
●
If the recommended duration of use of the air clean filter (3 months) has elapsed, it
may smell. Replace the filter as soon as possible. (Replacement is sold separately.)
●
This occurs during cool draft prevention or when the room temperature has already
reached the set temperature.
●
The room temperature already has reached the set temperature. (Dry operation)
●
If MODE selector button is pressed during the operation, it will operate with the very
low fan speed (LL) for about 3 minutes and after that, it will change to the set fan
speed.
●
Protective circuit may have engaged due to lightning. Disconnect the main power for
at least 1 minute. Then reconnect the power plug and try operating the air conditioner.
If the air conditioner operates, it is not malfunctioning.
Air flap is still running at start-up
and at operation stop.
It does not operate immediately
after being switched on.
Speed of indoor fan does not
change.
WARNING
Before performing any service on this air conditioning system, do the following:
1. Turn off the mains power.
2. Wait at least 10 minutes before opening the outdoor
unit. The outdoor unit controller (inverter) contains a
large electrolytic capacitor, so a potentially danger-
ous charge (at a voltage of 325 VDC) remains even
after the mains is turned off.
AND
3. Use a DC voltage meter to confirm voltage between
the terminals of the electrolytic capacitor (refer to
“C2: fixed capacitor,” in 7-2 Electric Wiring Diagram).
Plastic tubes
C2
