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Service Reminder
Call your Lennox service technician if the unit will not oper-
ate. 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
.
5 − Air filter should not be plugged, which will limit air flow.
6 − Is gas turned on at meter?
7 − Is manual main shut−off valve open?
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 __________________
Safety Precautions
If you discover any of the following, shut down your
unit, and contact a Lennox dealer for an inspection by
a licensed professional service technician (or equiva-
lent).
D
If you repeatedly hear any new or unfamiliar sounds
while your unit is operating, there may be a problem. For
example, poorly performing burners can produce unfa-
miliar noises.
D
If you smell any unusual odors, your unit may be operat-
ing improperly. For example, units can give off unfamil-
iar odors if components are required to operate in ab-
normal conditions.
D
Look for visible signs of a malfunctioning unit. Examples
include unusual amounts of condensate on windows in-
side your house, visibly burnt components or unusual
dirt or rust accumulations on the vent pipe or in the unit.
D
If you experience headache, nausea, fatigue, or dizzi-
ness, the cause could be exposure to carbon monoxide
gas. This is often misdiagnosed as the flu because
symptoms are similar. If you suffer from flu−like symp-
toms that are exaggerated at home, but seem to sub-
side while you are away from the house, exposure to
carbon monoxide could be the cause.
Your vigilance may pay off in early detection of a problem
before either personal injury or property damage occurs.
Do not hesitate to contact a qualified service technician as
an investment in your well being.
Planned Service
You should expect a service technician to check the follow-
ing items during an annual inspection. Power to the unit
must be shut off for the service technician’s safety.
Fresh air grilles and louvers
(on the unit and in the room
where the furnace is installed) − Must be open and unob-
structed to provide combustion air.
Burners
− Must be inspected for rust, dirt, or signs of water.
Vent pipe
− Must be inspected for signs of water, damaged
or sagging pipe, or disconnected joints.
Unit appearance
− Must be inspected for rust, dirt, signs
of water, burnt or damaged wires, or components.
Blower access door
− Must be properly in place and pro-
vide a seal between the return air and the room where the
furnace is installed.
Return air duct
− Must be properly attached and provide
an air seal to the unit.
Operating performance
− Unit must be observed during
operation to monitor proper performance of the unit and the
vent system.
Combustion gases
− Flue products must be analyzed and
compared to the unit specifications.
Problems detected during the inspection may make it nec-
essary to temporarily shut down the furnace until the items
can be repaired or replaced.
Pay attention to your furnace.
Situations can arise be-
tween annual furnace inspections that may result in unsafe
operation. For instance, items innocently stored next to the
furnace may obstruct the combustion air supply. This could
cause incomplete combustion and the production of car-
bon monoxide gas.
