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Troubleshooting / Before You Request a Service Call
If your furnace is not operating or is performing improperly, take time to perform the following checks before request-
ing service. A couple of simple checks may allow you to avoid a service call. If the following steps do not resolve the
problem, contact a qualified servicer for further troubleshooting and/or repairs. Do not attempt troubleshooting
beyond that which is outlined below. Do not attempt repairs yourself. Use the diagram on page 4 for parts reference.
If your furnace will not start, check the following (in sequence):
NOTE: If flashing, the integrated control module diagnostic LED flash code must be recorded prior to turning off the
power to the furnace or opening the blower compartment door. To determine the flash code, count the number of
flashes seen through the blower compartment door sight glass. Refer to the diagnostics chart for a description of the
LED flash codes and their possible causes.
•
Check thermostat for proper operation. Verify that it is set on HEAT and that temperature setting is above room
temperature.
•
Check to see that the electrical disconnect at the furnace location is in the ON position. If the switch is in the
OFF position, switch it to the ON position to supply electrical power to the furnace.
•
Check fuse or circuit breaker in furnace electrical circuit. Replace as necessary.
•
Check to see that the manual gas shut-off valve external 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 "Starting Your Furnace"
section.
NOTE: If flashing, record the integrated control module diagnostic LED flash code prior to power interruption. Turn off
furnace electrical power prior to proceeding.
•
Remove burner compartment door and check to see that gas valve ON/OFF switch is in the ON position. (See
figure on page 10) If the switch is in the OFF position, turn the gas ON following the start up procedures
outlined in the "Starting Your Furnace" section.
•
Remove blower compartment door and check to verify whether or not the manual reset auxiliary limit control
has tripped. The auxiliary limit control is located on the circulator blower. (See figure on page 4) If the auxiliary
limit control has tripped, a reset "click" will be heard when the red button on the back of the control is pressed.
Replace door. NOTE: Do not reset the auxiliary limit control more than once. If the control trips again, follow
the furnace shut down procedure outlined in the "Starting Your Furnace" section and contact a qualified
servicer.
•
Check for blockage at the termination(s) of flue pipe (and the combustion air intake pipe where present). Also
check for blockage in the drain trap. Clear if possible. (See figure on page 4)
•
Check for blockage in the drain lines. If blockage is present, please contact a qualified servicer.
If you experience insufficient airflow, check the following (in sequence):
•
Check for dirty filter(s). This is the most common cause of improper furnace operation. Replace or clean filters
as necessary.
•
Check for blocked return air or supply air grilles throughout your home. Grilles may be blocked by furniture,
drapery, clothes, carpeting, etc. Clear any blockage.
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