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6 Common Malfunction and Elimination
If the unit doesn't run normally, please check the following items before ask for
service.
Phenomenon
The unit can not be
activated.
The unit operates but
stops immediately.
Abnormal cooling or
heating.
NOTE: If reasons are still unclear after checking above items, please contact LENNOX
service center and show phenomena and models.
Reason
The unit doesn't connect with
power supply.
Low voltage.
Fuse broken or breaker trips
off.
Air inlet/outlet of indoor unit is
blocked.
Air inlet/outlet of indoor unit is
blocked.
Inappropriate temperature
setting.
Doors or windows are
opened.
Direct sunshine.
Too much heat source in the
room.
Filter screen is blocked by
dirt.
20
Air Handlers
Treatment
Connect with power
supply.
Check if circuit voltage
is within rated scope.
Replace fuse or
connect breaker.
Remove obstacles.
Remove obstacles.
Adjust setting at
thermostat.
Close the door or
windows.
Draw curtain or louver.
Reduce heat source.
Clean the filter.
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