Page 6
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Call your Lennox service technician if the unit will not op-
erate. Before calling, always check the following to be
sure service is required:
1 - Check that electrical disconnect switches are ON.
2 - Check room thermostat for proper setting.
3 - Replace any blown fuses or reset circuit breakers.
4 - Gas valve should be ON.
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6 - Is gas turned on at meter?
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Record the model and serial number of the furnace. These
numbers are on the unit nameplate, which is located on
the blower deck below the combustion air inducer.
Serial Number __________________
Model Number __________________
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• If you repeatedly hear any new or unfamiliar sounds
while your unit is operating, there may be a prob-
lem. For example, poorly performing burners can
produce unfamiliar noises.
• If you smell any unusual odors, your unit may be
operating improperly. For example, units can give
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operate in abnormal conditions.
• Look for visible signs of a malfunctioning unit. Ex-
amples include unusual amounts of condensate on
windows inside your house, visibly burnt compo-
nents or unusual dirt or rust accumulations on the
vent pipe or in the unit.
• If you experience headache, nausea, fatigue, or
dizziness, the cause could be exposure to carbon
monoxide gas. This is often misdiagnosed as the
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but seem to subside while you are away from the
house, exposure to carbon monoxide could be the
cause.
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before either personal injury or property damage occurs.
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an investment in your well being.
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Annual Furnace Maintenance
At the beginning of each heating season, and to comply
with the Lennox Limited Warranty, your system should
be checked as follows by a licensed professional service
technician (or equivalent).
1 - Check wiring for loose connections, voltage at
indoor unit and amperage of indoor motor.
2 - Check the condition of the belt and shaft bearings
if applicable.
3 - Inspect all gas pipe and connections for leaks.
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necessary (monthly).
5 - Check the condition and cleanliness of burners and
heat exchanger and clean if necessary.
6 - Check the cleanliness of blower assembly and
clean the housing, blower wheel and blower motor
if necessary.
7 - Inspect the condensate drain and trap for leaks and
cracks. The drain and trap must also be cleaned
and the trap must be primed with water. Inspect the
rubber hoses connected to the pressure switches for
cracks or loose connections, replace as necessary.
Remove the rubber hoses from the cold end header
box and inspect for any blockage, clean as needed.
If strainers are installed in the hoses remember to
remove and clean before reinstalling the hoses.
8 - Evaluate the heat exchanger integrity by inspecting
the heat exchanger per the AHRI heat exchanger
inspection procedure. This procedure can be
viewed at www.ahrinet.org
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furnace. Fresh air grilles and louvers (on the unit
and in the room where the furnace is installed)
must be properly sized, open and unobstructed to
provide combustion air.
10 - Inspect the furnace intake and exhaust pipes to
make sure they are in place, structurally sound,
without holes, blockage or leakage and the
exhaust pipe is sloped toward the furnace. Inspect
terminations to ensure they are free of obstructions
and are structurally sound. Inspect the furnace
return air duct connection to ensure the duct is
sealed to the furnace. Check for air leaks on supply
and return ducts and seal where necessary.
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