Fujitsu Troubleshooting Guide for Air Conditioners
Page 17

TROUBLESHOOTING

 

 

In the event of a malfunction (burning smell, etc.), immediately stop operation, disconnect the

WARNING!

Power Supply Plug, and consult authorized service personnel.

 

 

Merely turning off the unit’s power switch will not completely disconnect the unit from the

 

 

 

 

power source. Always be sure to disconnect the Power Supply Plug or turn off your circuit

 

 

breaker to ensure that power is completely off.

Before requesting service, perform the following checks:

 

Symptom

Problem

See Page

 

 

 

 

NORMAL

Doesn’t operate immedi-

● If the unit is stopped and then immediately started again, the com-

 

FUNCTION

ately:

pressor will not operate for about 3 minutes, in order to prevent

 

 

 

fuse blowouts.

—

 

 

● Whenever the Power Supply Plug is disconnected and then re-

 

 

 

 

 

connected to a power outlet, the protection circuit will operate for

 

 

 

about 3 minutes, preventing unit operation during that period.

 

 

 

 

 

 

Noise is heard:

● During operation and immediately after stopping the unit, the

 

 

 

sound of water flowing in the air conditioner’s piping may be

 

 

 

heard. Also, noise may be particularly noticeable for about 2 to 3

—

 

 

minutes after starting operation (sound of coolant flowing).

 

 

● During operation, a slight squeaking sound may be heard. This is

 

 

 

the result of minute expansion and contraction of the front cover

 

 

 

due to temperature changes.

 

 

 

 

 

 

 

● During Heating operation, a sizzling sound may be heard occasionally.

17

 

 

This sound is produced by the Automatic Defrosting operation.

 

 

 

 

 

 

 

 

Smells:

● Some smell may be emitted from the indoor unit. This smell is

—

 

 

the result of room smells (furniture, tobacco, etc.) which have

 

 

been taken into the air conditioner.

 

 

 

 

 

 

Mist or steam are

● During Cooling or Dry operation, a thin mist may be seen emitted

 

 

emitted:

from the indoor unit. This results from the sudden Cooling of

—

 

 

room air by the air emitted from the air conditioner, resulting in

 

 

 

 

 

condensation and misting.

 

 

 

 

 

 

 

● During Heating operation, the outdoor unit’s fan may stop, and

17

 

 

steam may be seen rising from the unit. This is due to the Auto-

 

 

matic Defrosting operation.

 

 

 

 

 

 

Airflow is weak or stops:

● When Heating operation is started, fan speed is temporarily very

 

 

 

low, to allow internal parts to warm up.

 

 

 

● During Heating operation, if the room temperature rises above

—

 

 

the thermostat setting, the outdoor unit will stop, and the indoor

 

 

 

 

 

unit will operate at very low fan speed. If you wish to warm the

 

 

 

room further, set the thermostat to a higher setting.

 

 

 

 

 

 

 

● During Heating operation, the unit will temporarily stop opera-

 

 

 

tion (between 7 and 15 minutes) as the Automatic Defrosting mode

17

 

 

operates. During the Automatic Defrosting operation, the OPERA-

 

 

 

 

 

TION indicator lamp will flash.

 

 

 

 

 

 

 

● The fan may operate at very low speed during Dry operation or

5

 

 

when the unit is monitoring the room’s temperature.

 

 

 

 

 

 

 

 

 

● During SUPER QUIET operation, the fan will operate at very low

5

 

 

speed.

 

 

 

 

 

 

 

 

 

● In the monitor AUTO operation, the fan will operate at very low

5

 

 

speed.

 

 

 

 

 

 

 

 

 

● In case of Multi-type unit, if multiple units are operated in differ-

 

 

 

ent operation modes as shown below, the units operated after-

 

 

 

ward will stop and the OPERATION indicator lamp (red) will flash.

18

 

 

Heating mode and cooling mode (or dry mode)

 

 

 

Heating mode and fan mode

 

 

 

 

 

 

Water is produced from

● During Heating operation, water may be produced from the out-

17

 

the outdoor unit:

door unit due to the Automatic Defrosting operation.

 

 

 

 

 

 

 

The AIR CLEAN indicator

● After approximately 400 hours of Air Cleaning Mode use, the AIR

 

 

lamp (green) will begin to

CLEAN indicator lamp will begin to flash slowly (as shown in the

13 - 14

 

slowly flash (as shown in

figure). When this occurs, please stop the system, remove the

 

the figure):

mains socket and carry out maintenance on the dust collecting

 

 

 

unit’s air filter.

 

 

 

 

 

 

The AIR CLEAN indicator

● After approximately 500 hours of Air Cleaning Mode use, the AIR

 

 

lamp (green) will begin to

CLEAN indicator lamp will begin to flash quickly (as shown in the

 

 

flash quickly (as shown in

figure). At this point, Air Cleaning will stop functioning. Please

13 - 14

 

the figure):

stop the system, remove the mains socket and carry out mainte-

 

 

 

nance on the dust collecting unit’s air filter.

 

 

 

 

 

En-16

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Contents Page Safety Precautions ContentsName of Parts Auto Changeover Features and FunctionsPreparation Operation To Select Mode Operation Press the Start / Stop button JTo Set the Thermostat Press the SET TEMP. buttons F To Set the Fan Speed Press the FAN Control buttonAbout Auto Changeover Operation About Mode OperationPress the AIR Clean button K AIR Cleaning OperationIf you wish to stop Air Clean Air cleaningTimer Operation To Cancel the Timer Sleep Timer OperationAbout the Sleep Timer During Heating operationVertical Air Direction Adjustment Press the SET button L Adjusting the Direction of AIR CirculationRight-Left Adjustment Adjust the Right-Left louvers Types of Air flow Direction SettingCoil DRY Operation Swing OperationManual Auto Operation To select Swing Operation Press the Swing button MCleaning and Care Regarding the Air Cleaning check function Cleaning the Plasma AIR Cleaning FilterOpen the intake grille and remove the air Filter on the rightClose the intake grille Install the unitInstall the air filter Install the Air-cleaning and Deodorizing filter Install the dust-collection unitInstall the air filter and close the intake grille Remove the dust-collecting unitSymptom Problem TroubleshootingSymptom Items to check Event of Power InterruptionOperating Tips Operation and PerformanceSimultaneous Use of Multiple Units Temperature and Humidity RangeMulti-type Air conditioner

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