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To remove all other filter configurations, consult with the in-
stalling contractor.
M
A
F
E
EDIA
IR
ILTER OR
LECTRONIC
High efficiency filters are available in both electronic and non-
electronic types. These filters can do a better job of catch-
ing small airborne particles. Contact your dealer for further
information.
If using a Media or Electronic Air Cleaner, follow the direc-
tions provided with the air cleaner for proper filter removal,
cleaning, and replacement.
F
C
/
ILTER
LEANING AND
OR
Disposable filters must be replaced with a filter or filters of
the same size as that which is removed. Filters must com-
ply with UL900 or CAN/ULC-S111 Standards.
Permanent filters must be cleaned, washed, and dried as
specified by the filter manufacturer. If it becomes necessary
to replace a permanent filter, it must be replaced with a filter
or filters of the same size as that which is removed. Filters
must comply with UL900 or CAN/ULC-S111 Standards.
When reinstalling filters, be careful to maintain correct air-
flow direction.
T
/ B
ROUBLESHOOTING
EFORE
If your furnace is not operating or is performing improperly,
take time to perform the following checks before requesting
service. A couple of simple checks may allow you to avoid a
service call. If the following steps do not resolve the prob-
lem, contact a qualified servicer for further troubleshooting
and/or repairs. Do not attempt troubleshooting beyond that
which is outlined in the following bullet points. Do not at-
tempt repairs yourself.
• Check the blower compartment sight glass. If LED is
flashing, record the number of flashes seen in sequence,
shutdown your unit as outlined in the "Furnace Start-up"
section and contact a qualified servicer for further trouble-
shooting and/or repairs. Refer to Installation Instructions
for code identification.
checks.
A
C
R
IR
LEANER
EMOVAL
R
EPLACEMENT
Y
R
S
OU
EQUEST A
ERVICE
If not flashing, continue with
• Check thermostat for proper operation. Verify that it is
set on HEAT and that temperature (above room tem-
perature) setting is appropriate.
• Check the electrical panel for tripped circuit breakers or
failed fuses. Reset the circuit breakers or replace fuses
as necessary.
• Check to see that the manual gas shut-off valve exter-
nal to the furnace is in the ON position. If the valve is in
the OFF position, turn the gas ON following the start up
procedures outlined in the "Furnace Start-up" section.
• Check for dirty filter(s). This in the most common cause
of improper furnace operation. Check your filter(s) at
least once a month and replace or clean filters as nec-
essary.
• Check for blocked return air or supply air grilles through-
out your home. Grilles may be blocked by furniture, drap-
ery, clothes, carpeting, etc. Clear any blockage.
• Check intake and vent terminations on high efficiency
furnaces to make sure they are not blocked.
• If your furnace is part of a ComfortNet™ system, check
the ComfortNet thermostat for diagnostic alerts or mes-
sages. If the system detects a serious fault in either the
furnace or outdoor unit, the thermostat will display a
"CALL FOR SERVICE" message and scroll the message
"CHECK FURNACE". The thermostat may also scroll
"CHECK AIR CONDITIONER" or "CHECK HEAT PUMP"
if a serious fault is detected in the outdoor unit (mes-
sage depends on type of outdoor unit.).
C
ALL
8
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