Fujitsu AWU24RXQ, AWU18RXQ, AWU24CXQ, AWU18CXQ, AOU18CXQ, AOU24RXQ Troubleshooting, Symptom Problem

Page 18

TROUBLESHOOTING

Instructions relating to heating (*) are applicable only to “HEAT & COOL MODEL” (Reverse Cycle).

In the event of a malfunction (burning smell, etc.), immediately stop operation, turn off the elec-

WARNING! trical breaker or disconnect the 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 turn off the electrical breaker or disconnect the power supply plug 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 electrical breaker is turned off then on again or the

—

 

 

power supply plug is disconnected and then reconnected, the pro-

 

 

 

tection 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.

 

 

 

● If an unusual noise is heard from the electronic air clean unit, check if

 

 

 

the dust collection unit is dirty and make sure that it is installed cor-

14, 15

 

 

rectly. Clean the dust collection unit and install it correctly if necessary.

 

 

 

*● During Heating operation, a sizzling sound may be heard occasion-

18

 

 

ally. 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

 

 

 

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

18

 

 

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

18

 

 

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

6

 

 

when the unit is monitoring the room’s temperature.

 

 

 

 

 

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

6

 

Water is produced from

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

18

 

the outdoor unit:

door unit due to the Automatic Defrosting operation.

 

 

 

Flashing air clean indica-

● This lamp will flash slowly after approximately 400 hours of air

 

 

tor lamp (green):

cleaning operation.

 

 

 

Stop the operation, turn off the power supply and clean the dust

 

 

 

collection unit and air filter.

 

 

 

● This lamp will flash quickly after approximately 500 hours of air

14

 

 

cleaning operation.

 

 

 

The air cleaning operation will be stopped when this flashing

 

 

 

occurs. Make sure the operation is stopped, turn off the power

 

 

 

supply and clean the dust collection unit and air filter.

 

 

 

● This lamp will flash quickly if the dust collection unit is not in-

 

 

 

stalled correctly.

15

 

 

Stop the operation, turn off the power supply, and then install the

 

 

 

 

 

dust collection unit correctly.

 

17

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Contents Wall Mounted Type Contents Safety PrecautionsFeatures and Functions Automatic OperationName of Parts Red Timer Indicator Lamp yellow Swing Indicator Lamp orangeAIR Clean Indicator Lamp green Vertical SET buttonPreparation To Set the Thermostat Press the SET TEMP. buttons To Select Mode Operation Press the START/STOP button MOperation To Set the Fan Speed Press the FAN Control button LHeating About Mode OperationHeat & Cool Model Reverse cycle DryStopping air cleaning operation Press the AIR Clean button AIR Cleaning OperationPress the AIR Clean button G Air cleaningTimer Operation Manual Auto Operation To Change the Timer SettingsAbout the Sleep timer During Cooling/Dry operationHorizontal Air Direction Adjustment Adjusting the Direction of AIR CirculationVertical Air Direction Adjustment Types of Air flow Direction SettingSwing Operation About Swing OperationAir flow direction set Range of swing Install the intake filters Cleaning and CareCleaning the Intake Filters Remove the intake filters Clean the intake filtersRemoving the dust collection unit Cleaning the Electronic AIR Clean UnitCleaning the dust collection unit Wash with water and dry Remove the dust collection unitInstall the intake filter. Refer to Selecting the Remote Control Unit Signal Code Selecting the Remote Control Unit Signal CodeInitially set to Press Troubleshooting Symptom ProblemOperation and Performance When Indoor and Outdoor Temperatures are HighOperating Tips Low Ambient CoolingTemperature and Humidity Range Event of Power InterruptionAuto Restart

AWU24RXQ, AOU24RXQ, AWU18RXQ, AWU18CXQ, Room Air Conditioner - Wall Mounted specifications

The Fujitsu AWU24CXQ, AWU18RXQ, AOU18RXQ, AWU24RXQ, and AOU24RXQ series of air conditioning units are designed to provide efficient cooling and heating solutions for various residential and commercial environments. Fujitsu is renowned for its innovative technology and reliability, which is evident in these models.

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