Lennox G43UF SERIES

,:Q"'".';,l'''
:l~~~~ Ih
Call your Lennox selVice technician if the unit will not oper-
ate. Before calling, always check the following to be sure
salVice is required;
1 - Check that electrical disconnect switches are ON.
2 -
Check room thermostat for proper setting.
3 - Replace any blown fuses Or reset circuli breakers.
4 - Gas valve should be ON.
5 - Air filler should not be plugged, which will limit air now.
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
!'Cfliil{ '''.1' «P' ';"~" ·1
~~'~11"'~ ;1\1,'!'~ i~"',
If you discover any of the following, shut down your
unit,
and contact a lennolC dealer for an inspection by
a licensed professional service technician (or equIva-
lent).
• 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.
• 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.
• Look (or 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.
• 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 payoff in early detection of a problem
before either personal injUry or property damage occurs,
Do not hesitate to conlact a qualified service technician as
an investment in your well being.
~,I,: .... , ';~~: ... 1Il:::: .. :.:"
You should expect a selVice 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 waler, 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 - Musl be properly attached and proVide
an air seal to the unit.
operating performance. Unit must be observed during
operation to tnonilor proper performance of the unit and the
vent system.
Combustion gase8 - Flue products must be analyzed and
compared to the unit speclflcations.
Problems detected during Ihe inspection may make it nec-
essary to temporarily shut down the furnace unlil the Items
can be repaired or replaced.
Pay attention to your furnace. Situations can arise be-
tween annual fumace inspections that may result in unsafe
operation. For instance. items innocently stored ne>rt to the
fumace may obstruct the combustion air supply. This could
cause incomplete combustion and the production 01 car-
bon monOXide gas.
Page 6
sa)!hJaS l'eJ!u'e4H~ J!'el8
L .d
6HS 'oN
.,.n£lt's:tst~ ..