Fujitsu KN Series Operation Manual page 13

Noise is heard.
□ Is the unit operating, or immediate after stopping operation?
In this case, refrigerant fl owing 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 8.)
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 [ ] indicator on the indoor unit blinking?
In this case, steam may rise from the outdoor unit because of the
Automatic defrosting operation.(Refer to page 11.)
Outdoor unit emits water.
□ <In the Heating mode> The outdoor unit may emit water gener-
ated by the Automatic defrosting operation. (Refer to page 11.)
The unit operates diff erently from the remote controller setting.
□ Are the batteries in the remote controller exhausted?
⇒ Replace the batteries.
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.
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.
• On the indoor unit, [ ] and [
■ State of indicator lamps
: The instruction is relating to the wireless LAN control.
Lighting pattern: Blinking,
Lighting.
State Causes and solutions
Automatic defrosting operation
⇒ Wait until fi nishing the defrosting
(maximum of 15 minutes).
Filter indicator
⇒ Clean the air fi lter and reset the fi lter
sign.
(3 times)
Error code display
⇒ Consult authorized service personnel.
(Fast)
Timer setting error because of Auto restart
⇒ Reset the clock and timer settings.
Test run operation (for authorized
personnel only)
⇒ Press
] blink while [ ] is blinking fast.
Any state,
page
to quit the test run.
(Slow)
or
(Slow)
See
11
(Slow)
■ Manual Auto operation and Filter indicator
11
reset
You can operate the air conditioner with
Status Length of pressing down Mode or operation
-
In operation More than 3 seconds
Stopping 2 seconds or less
More than 3 seconds and
11
less than 10 seconds
More than 10 seconds
(Only for servicing.)(*2)
4
*1: In the multi-split connection, the operation mode follows the other
indoor units.
*2: To stop the forced cooling, press this button or
controller.
En-13
The power to the access point is not
on.
⇒ Check that the power to the wireless
router is on.
There is a possibility that the WLAN
device is not properly connected to
the access point.
⇒ Disconnect the power supply to the air
conditioner (via breaker or plug), and
then re-connect.
The fi rmware of the WLAN device is
being updated. 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).
During the air conditioner registration
(pairing of WLAN device)
The indoor unit is preparing the
fi rmware update.
You cannot operate the air
conditioner. Wait until the update is
complete (for a maximum of
30 minutes).
<While the operation is stopped>
The indoor unit is in the fi rmware
update.
You cannot operate the air
conditioner. Wait until the update
is complete (for a maximum of
30 minutes).
<While the operation is stopped>
The fi rmware update of the indoor
unit is complete. The settings from
the wireless remote controller are
initialized.
Control the air conditioner from the
wireless remote controller to resend
the settings.
<While the operation is stopped>
If you cannot operate the air
conditioner, the malfunction may
occur on the fi rmware of the indoor
unit.
Consult authorized service personnel.
Restricted function
(In the multi-split connection) Standby
mode
⇒ Check the set operation mode of the
indoor units.
on the indoor unit.
Stop
Filter indicator reset
Auto(*1)
Forced cooling
-
9
9
9
9
9
9
-
-
12
on the remote