Troubleshooting - Fujitsu ACY63-KA Operation Manual

10. TROUBLESHOOTING

In following events, immediately stop operation of the
air conditioner, and disconnect all the power supply by
turning off the electrical breaker or disconnecting the
power plug. Then consult your dealer or authorized
service personnel.
As long as the unit is connected to the power supply, it
is not insulated from the power supply even if the unit is
turned off.
• Unit smells of something burning or emits smoke
• Water leaks from the unit
Does not operate at all.
□ Has there been a power outage?
In this case, the unit restarts automatically after the power supply
is resumed. (Refer to page 5.)
□ Has the circuit breaker been turned off?
⇒ Turn on the circuit breaker.
□ Has a fuse blown out or the circuit breaker been tripped?
⇒ Replace the fuse or reset the circuit breaker.
□ Is the timer operating?
⇒ To check or deactivate the timer setting, Refer to the operation
manual of the remote controller.
□ <When using the wireless LAN control> Is the WLAN adapter in a
firmware update?
During the firmware update of the WLAN adapter, you cannot
operate the air conditioner from the mobile app. Operate from
the remote controller or wait until the update is complete (for a
maximum of 5 minutes).
□ <When using the wireless LAN control> Is the indoor unit in a
firmware update?
During the firmware update of the indoor unit, the air conditioner
stops the operation. Wait until the update is complete. (for a maxi-
mum of 30 minutes).
Poor cooling or heating performance.
□ Is the unit operating under the conditions except the permissible
temperature range?
In this case, the air conditioner may stop because of the automatic
protection circuit working.
□ Is the air filter dirty?
⇒ Clean the air filter. (Refer to page 4.)
□ Is the intake grille or outlet port of indoor unit blocked?
⇒ Remove the obstructions.
□ Is the room temperature adjusted appropriately?
⇒ To change the setting temperature, refer to the operation
manual of the remote controller.
□ Is a window or door left opened?
⇒ Close the window or the door.
□ Is the fan speed set to Quiet?
⇒ To change the fan speed, refer to the operation manual of the
remote controller.
□ Is the air conditioner in the Economy operation?
⇒ To stop the Economy operation, refer to the operation manual
of the remote controller.
□ <In the Cooling mode> Is direct or strong sunlight shining into the
room?
⇒ Close the curtains.
□ <In the Cooling mode> Are there other heating apparatus or com-
puters operating, or too many people in the room?
⇒ Turn the heating apparatus or computers off, or set the
temperature lower.
En-7
WARNING
Airflow is weak or stops.
□ Is the fan speed set to Quiet?
⇒ To change the fan speed, refer to the operation manual of the
remote controller.
□ Has the Fan Control for Energy Saving been set? In this case, the
indoor unit fan may stop temporarily while the Cooling operation.
⇒ To cancel the Fan Control for Energy Saving, refer to the op-
eration manual of the remote controller.
* This function cannot be disabled when the fan speed is set to
AUTO.
□ <In the Heating mode> Have you just started the operation?
In this case, the fan rotates at very low speed temporarily to warm
up the internal parts of the unit.
□ <In the Heating mode> Is the room temperature higher than the
set temperature?
In this case, the outdoor unit stops and the indoor unit fan rotates
at very low speed.
□ <In the Heating mode> Is the Automatic defrosting operation
working? In this case, the indoor unit stops for maximum of 15
minutes. (Refer to page 5.)
□ <In the Dry mode> The indoor unit operates at low fan speed to
adjust the room humidity, and may stop from time to time.
□ <In the Auto mode> While the monitoring operation, the fan
rotates at very low speed.
□ <In multi-split connection> Are multiple units set in different opera-
tion mode as shown below?
In this case, the units set afterward will stop.
• Heating mode and other mode
Humidity does not drop.
□ <In the Dry operation> If the setting temperature is high, the
humidity may not drop.
⇒ To lower the humidity, lower the setting temperature.
Noise is heard.
□ Is the unit operating, or immediate after stopping operation?
In this case, refrigerant flowing sound may be heard. It may be
particularly noticeable for 2-3 minutes after starting operation.
□ Do you hear a slight squeaking sound during the operation?
This sound is produced by the minute expansion and contraction
of the front panel caused by temperature change.
□ <In the Heating mode> Do you hear a sizzling sound?
This sound is produced by the Automatic defrosting operation.
(Refer to page 5.)
Smell coming from the unit.
□ The air conditioner may absorb various smells generated from
interior textile, furniture, or cigarette smoke. These smells may be
emitted during the operation.
Mist or steam is emitted from the unit.
□ <In the Cooling or Dry mode> A thin mist may be generated by
condensation formed with sudden cooling process.
□ <In the Heating mode> Is the Automatic defrosting operation
working? In this case, steam may rise from the outdoor unit. (Re-
fer to page 5.)
Outdoor unit emits water.
□ <In the Heating mode> The outdoor unit may emit water gener-
ated by the Automatic defrosting operation. (Refer to page 5.)
Operation is delayed after restart.
□ Has the power supply turned from off to on suddenly?
In this case, the compressor will not operate for about 3 minutes
to prevent a blowout of the fuse.
□ Has the electrical breaker been turned off then on again?
In this case, the protection circuit will operate for about 3 minutes.
Immediately stop operation and turn off the electrical breaker in
following cases. Then consult authorized service personnel.
• The problem persists even if you perform these checks or
diagnostics.
• Error sign is shown on the wired remote controller display or the
indicator lamps on the IR receiver unit.
NOTE:
For any troubleshooting related to the WLAN control, refer to the
setting manual for WLAN adapter or the mobile app installed in your
smartphone or tablet PC.