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4. Replace the access doors and
restore electrical supply to the
furnace. Be sure bottom door
flange is inside of the furnace cas-
ing. (See Fig. 16 and 17.)
5. Start the furnace and observe its
operation. If possible, watch the
burner flames. Are they burning
bright blue? If not or if you sus-
pect some other malfunction, call
your servicing dealer.
BEFORE YOU REQUEST
A “SERVICE CALL’’
BEFORE YOU CALL FOR
SERVICE, CHECK FOR
SEVERAL EASILY SOLVED
PROBLEMS:
• Check for sufficient airflow. Check
the air filter for dirt. Check for blocked
return-air or supply-air grilles. Be sure
they are open and unobstructed. If this
isn’t the cause of the problem, call your
servicing dealer.
If your furnace isn’t operating at all,
check the following list for easily
solved problems:
• Is your thermostat set above room
temperature? Is the switch in the
HEAT position?
• Is the electrical power supply switch
on? Is the blower access door firmly in
place? Are any fuses blown? (There is a
fuse on the furnace control.) Has a cir-
cuit breaker tripped?
• Is the manual shutoff valve in the gas
supply pipe leading to the furnace
open? Does the lever point in the same
direction that the pipe runs (open)? Or is
it at a right angle to the pipe (closed)?
NOTE:
Before proceeding with the
next checks, turn off the electrical
power supply to the furnace. Remove
access doors.
• Is the control knob or switch on the
gas valve turned to the ON position? If
this or the preceding check shows
an interruption in the gas supply,
make sure the gas has not been shut
off for safety reasons. If nothing else
seems to be wrong, follow the startup
procedures found on pages 4 and 5
of this booklet.
• If for some reason the vent is
blocked, the draft safeguard switch will
shut off the furnace. Reset the switch
by pushing the button located on top
of the switch. See page 2 or 3 for switch
location.
If the switch trips a second time, turn
off the furnace and call for service.
•
DOWNFLOW HORIZONTAL
ONLY—Check the manual reset auxil-
iary limit switch located on the blower
housing. If the blower motor fails, this
switch will shut off the furnace. Reset it
by pushing the button on the switch. If
it trips again, turn off the furnace and
call for service.
• Check the manual reset flame roll-
out switch(es) located near the burn-
ers. If the furnace has experienced a
high-temperature condition due to
inadequate combustion air, these
switches will shut off the furnace.
Reset the switch(es) by pushing the
button on the switch. If the switch trips
a second time, turn off the furnace and
call for service.
• If your furnace still fails to operate,
call your servicing dealer for trouble-
shooting and repairs. Tell your dealer
the model and serial numbers for your
furnace. (You should have them
recorded on page 12 of this booklet.)
By knowing exactly which furnace you
have, the dealer may be able to offer
suggestions over the phone or save
valuable time through knowledgeable
preparation for the service call.
• Your furnace control board has an
LED fault code light that indicates
the furnace status. The LED will flash
short and long flashes. Look through the
sight glass on the furnace door and
determine the code (number
of short and long flashes). Give the
code and furnace model number to
your dealer when you call. By knowing
exactly which furnace you have and
the LED code being displayed, your
dealer can save valuable time through
knowledgeable preparation for the ser-
vice call.
REGULAR DEALER
MAINTENANCE
In addition to the type of routine
maintenance you might be willing to
do, your furnace should be inspected
regularly by a properly trained service
technician. A semiannual inspection
(or annual inspection, at least) should
include the following:
1. Inspection of all flue product
passages including the burners,
heat exchanger, relief box, and
vent pipe.
2. Inspection of all combustion and
ventilation air passages and
openings.
3. Close check of all gas pipes lead-
ing to and inside of your furnace.
4. Inspection, cleaning, and lubrica-
tion (when required) of the
blower motor and wheel.
NOTE: Refer to the unit Service
Procedures for blower motor oiling
information. When required, the
motor must be oiled by a qualified
service technician.
5. Routine inspection and cleaning/
replacement of the air filter.
6. Inspection of all supply- and
return-air ducts for obstructions,
air leaks, and insulation. Any
problems found should be
resolved at this time.
7. Inspect the return-air duct con-
nection(s) at the furnace to
ensure it is physically sound,
sealed to the furnace casing, and
terminates outside the space con-
taining the furnace.
8. Inspection of furnace installation
for proper support and any ob-
vious deterioration of the furnace.
The support must be sound and
WARNING
If holes are found or if the vent
pipe is obstructed or is not
connected, toxic fumes can es-
cape into your home. DO NOT
OPERATE YOUR FURNACE.
Call your dealer for service.
A failure to follow this warning
could result in personal injury
or death.
!