Troubleshooting - Fujitsu ASTG18LF Operating Manual

WARNING!

Before requesting service, perform the following checks:

NORMAL

Doesn't operate immedi-

ately:

FUNCTION

Noise is heard:

Smells:

Mist or steam is

emitted:

Airfl ow is weak or stops:

Water is produced from the

outdoor unit:

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

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

● If the indoor unit is stopped and then immediately started

again, the compressor will not operate for about 3 minutes, in

order to prevent fuse blowouts.

● Whenever the electrical breaker is turned off then on again

the protection circuit will operate for about 3 minutes, pre-

venting unit operation during that period.

● During operation or immediately after stopping the unit, the

sound of water fl owing 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 refrigerant

fl owing).

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

This is the result of minute expansion and contraction of the

front panel due to temperature changes.

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

casional. This sound is produced by the Automatic Defrosting

operation.

● 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 indoor unit.

● 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 cool air emitted from the indoor

unit, 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 Defrosting operation.

● 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 set-

ting.

● During Heating operation, the indoor unit will temporarily

stop operation (Max. 15 minutes) as the Automatic Defrosting

mode operates. During Automatic Defrosting operation, the

OPERATION Indicator Lamp will fl ash.

● During Dry mode, the indoor unit will operate at low speed;

in order to adjust room humidity, the indoor unit's fan may

stop from time to time. Also, the fan may operate at very low

speed when adjusting room humidity.

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

low speed.

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

low speed.

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

different operation modes as shown below, the units oper-

ated afterward will stop and the OPERATION indicator lamp

(green) will fl ash.

Heating mode and cooling mode (or dry mode)

Heating mode and fan mode

● During Heating operation, water may be produced from the

outdoor unit due to Automatic Defrosting operation.

Problem

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12/2/2010 8:44:44 AM

12/2/2010 8:44:44 AM