Fujitsu ABT series Operating Manual - Page 15

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TROUBLESHOOTING

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

WARNING!

Before requesting service, perform the following checks:

NORMAL

Doesn't operate immedi-

FUNCTION

ately:

Noise is heard:

Smells:

Mist or steam are

emitted:

Airflow is weak or stops:

Water is produced from

the outdoor unit:

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

trical breaker, 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 to ensure that power is completely off.

Symptom

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

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

fuse blowouts.

G Whenever the power switch is turned off then on again, the pro-

tection circuit will operate for about 3 minutes, preventing unit

operation during that period.

G 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).

G 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.

*G During Heating operation, a sizzling sound may be heard occa-

sionally. This sound is produced by the Automatic Defrosting op-

eration.

G 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.

G During Cooling or Dry operation, a thin mist may be seen 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.

*G 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-

matic Defrosting operation.

*G When Heating operation is started, fan speed is temporarily very

low, to allow internal parts to warm up.

*G 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.

*G During Heating operation, the unit will temporarily stop opera-

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

operates. During the Automatic Defrosting operation, the OPERA-

TION indicator lamp will flash.

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

when the unit is monitoring the room's temperature.

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

speed.

G In case of Multi-type unit, if multiple unit are operated in different

operation modes as shown below, the units operated afterward

will stop and the OPERATION indicator lamp on the indoor unit

will flash.

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

door unit due to the Automatic Defrosting operation.

Problem

Heating mode and cooling mode (or dry mode)

Heating mode and fan mode

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