Fujitsu ASU18RLQ, ASU15RLQ, AOU18RLQ, AOU15RLQ operation manual Troubleshooting, Symptom Problem

Page 18

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 occasional.

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

 

 

 

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

17

 

 

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 for 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 Automatic Defrosting operation, the OPERATION

 

 

 

 

 

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.

 

 

 

 

 

 

 

 

Water is produced from

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

17

 

the outdoor unit:

door unit due to Automatic Defrosting operation.

 

 

 

The AIR CLEAN Indicator

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

 

 

Lamp (green) will begin

CLEAN Indicator Lamp will begin to flash slowly (as shown in the

 

 

to slowly flash (as shown

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

13-14

 

in 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

 

 

CLEAN Indicator Lamp will begin to flash quickly (as shown in

 

 

Lamp (green) will begin

 

 

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

13-14

 

to flash quickly (as shown

 

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

 

 

in the figure):

 

 

nance on the dust collecting unit's air filter.

 

 

 

 

 

 

 

 

En-16

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Contents Operating Manual Español Français EnglishTo facilitate explanation, the accompanying illustra Contents Safety PrecautionsFeatures and Functions InverterName of Parts Indoor Unit Operating Control Panel Fig Manual Auto buttonPreparation Operation About Mode Operation To Stop Operation Press the START/STOP button NAbout Auto Changeover Operation If you wish to stop Air Clean AIR Cleaning OperationPress the AIR Clean button O Air cleaningTimer Operation During Heating operation Sleep Timer OperationAbout the Sleep Timer During Cooling/Dry operationRight-Left Adjustment Adjust the Right-Left louvers Adjusting the Direction of AIR CirculationVertical Air Direction Adjustment Press the SET button Q Types of Air flow Direction SettingManual Auto Operation Swing OperationCoil DRY Operation To select Swing Operation Press the Swing button TCleaning and Care Remove the dust collection unit Cleaning the Plasma AIR Cleaning FilterRegarding the Air Cleaning check function Wash with water and dryInstall the unit Install the air filterClose the intake grille Install the air filter and close the intake grille Install the dust-collection unitInstall the Air-cleaning and Deodorizing filter Remove the dust-collecting unitTroubleshooting Symptom ProblemOperation and Performance Event of Power InterruptionOperating Tips Auto RestartIndoor temperature About 64 F to 90 F Or less Temperature and Humidity RangeCooling Mode Dry Mode Heating Mode Outdoor temperature Tips for saving energy

AOU18RLQ, AOU15RLQ, ASU18RLQ, ASU15RLQ specifications

Fujitsu is a prominent name in the HVAC industry, known for its innovative air conditioning solutions that combine efficiency, comfort, and advanced technologies. Among its popular models are the AOU15RLQ, AOU18RLQ, ASU15RLQ, and ASU18RLQ. These units are designed to meet diverse cooling and heating needs for residential and commercial spaces.

The AOU15RLQ and AOU18RLQ are outdoor units that serve as the backbone of Fujitsu's multi-split air conditioning systems. One of their main features is their ENERGY STAR certification, which ensures superior energy efficiency. Both models incorporate inverter technology, allowing them to adjust their cooling and heating output based on the current demand. This leads to reduced energy consumption and increased comfort.

Moreover, these outdoor units operate quietly, providing a peaceful environment for users. They are designed with a compact footprint, making them suitable for various installation locations. The AOU series also supports multi-zone configurations, allowing homeowners to control different areas of their space independently, thereby enhancing comfort and efficiency.

On the other hand, the ASU15RLQ and ASU18RLQ are the corresponding indoor units that work seamlessly with their outdoor counterparts. These models feature a sleek design that can effortlessly blend into any décor. They utilize advanced air filtration systems that capture dust, allergens, and other pollutants, promoting indoor air quality.

Both indoor models offer multiple fan speeds and adjustable airflow direction, ensuring optimal distribution of conditioned air. The ASU series is equipped with user-friendly remote controls and includes programmable timers, allowing for customizable operation that aligns with users' schedules.

Fujitsu has also integrated smart technology into these units. The models can be connected to Wi-Fi, enabling users to control their air conditioning systems remotely through their smartphones. This integration facilitates monitoring and adjusting settings from anywhere, enhancing convenience.

In summary, the Fujitsu AOU15RLQ, AOU18RLQ, ASU15RLQ, and ASU18RLQ represent a harmonious blend of innovation and efficiency. With their advanced inverter technology, energy-saving features, and smart connectivity, these air conditioning systems are well-suited for modern homes looking for reliable and effective climate control solutions. Whether for residential use or light commercial applications, these models cater to a broad spectrum of comfort needs, ensuring a pleasant indoor environment year-round.
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