Lennox 4 Series Installation Manual page 24

Table 12: Abnormal Operating Conditions and Reasons
Air conditioner doesn't run
Mist is blown from the air
conditioner
Noise is heard from the air
conditioner
Dust is blown from the air
conditioner
Odour is smelt from the air
conditioner
Indoor unit still runs
24
"Malfunction"
• When starting the unit
immediately after turning
the unit off
• When turning on the power
• When cooling
• Slight click sound heard
once begin running
• Hissing sound heard
continuously when cooling
• Hissing sound heard when
staring or stopping
• Slight hissing sound heard
when running or after
running
• Creaking sound heard
when running or after
running
• Started up after an
extended period of
stagnation
• When running
• After being switched off
LENNOX MULTI SPLIT INVERTER
• The overload switch
protecting the unit results
in a 3 minute delay
• Run for about 1 minute
without other actions
• The high humidity air in
room is cooled rapidly
• Sound of initialisation for
the electric expand valve
• The sound of gas
refrigerant flowing in the
unit
• The sound of gas
refrigerant flow stopping
• Sound of drainage system
• The sound caused by
expansion of the panel
and other parts from the
change in temperature
• Dust which has been
collected in the indoor unit
is being blown out
• Odours from the room
which have been collected
in the indoor unit are being
discharged
• The indoor fan motor will
keep running for up to 70
seconds to use excess
cooling and heating and
prepare for next operation
13 23 50
Outdoor Unit
Reason
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