ASU7RLF1 Operation Manual

En-15
TROUBLESHOOTING
WARNING!
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.
Before requesting service, perform the following checks:
Symptom Problem See Page
NORMAL
FUNCTION
Doesn’t operate immedi-
ately:
●
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, preventing
unit operation during that period.
—
Noise is heard:
●
During operation or 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 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 occasion-
al. This sound is produced by the Automatic Defrosting operation.
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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 indoor unit.
—
Mist or steam is
emitted:
●
During Cooling or Dry operation, a thin mist may be seen emit-
ted 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.
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Airfl ow 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 indoor unit will temporarily stop
operation (between 7 and 15 minutes) as the Automatic Defrost-
ing mode operates. During Automatic Defrosting operation, the
OPERATION Indicator Lamp will fl ash.
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●
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.
7
●
During SUPER QUIET operation, the fan will operate at very low speed. 6
●
In the monitor of AUTO operation, the fan will operate at very
low speed.
7
●
In case of Multi-type unit, if multiple units are operated in different
operation modes as shown below, the units operated 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
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Water is produced from
the outdoor unit:
●
During Heating operation, water may be produced from the out-
door unit due to Automatic Defrosting operation.
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