Nordyne *SA Upfl ow / Horizontal Installation Instructions Manual Download Page 25

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13. *SA models - Carefully remove the inducer assembly

from the furnace.

*SK models - Carefully remove the inducer assembly
and combustion tube assembly from the furnace.

NOT BREAK THE SEALS AT EACH END OF THE
COMBUSTION AIR TUBE.

14. Remove all screws securing the collector pan to the

furnace.

15. Remove the collector pan and gasket from the furnace.
16. Attach a round wire brush to a length of high grade

stainless steel cable. Attach the other end of the cable to
a variable speed reversible drill. Slowly insert and rotate
the cable into the top portion of the heat exchanger.
Operate the drill alternating between forward and
reverse, working the cable in and out several times
to obtain suffi cient cleaning. Repeat this sequence for
each heat exchanger tube.

17. Remove all loosened debris from the heat exchanger

tubes using a vacuum cleaner.

18. Using a bright light, check the condition of the upper

and lower sections of the heat exchanger tubes.

19. Inspect the burners for accumulated dust or debris. If

burners must be cleaned, see page 24.

20. Replace all the parts in reverse order that they were

removed.

21. Check gaskets for damage and replace if needed.
22. Follow the lighting instructions found on the furnace

door to return the furnace to operation. Verify proper
operation after servicing.

Vent System

WARNING:

Holes in the vent pipe or heat exchanger can
cause combustion products to enter the home.
Replace the vent pipe or heat exchanger if leaks
are found. Failure to prevent the circulation
of combustion products into the living space
can create potentially hazardous conditions
including carbon monoxide poisoning that
could result in personal injury or death.

Check the vent pipe and/or chimney for corrosion or debris.
Any corroded section of vent pipe must be replaced, and
any obstruction or blockage must be removed prior to
operating the furnace.

Heat Exchanger & Burner Maintenance

The furnace should operate for many years without soot
buildup in the fl ue passageways, however, the fl ue, vent
system, and burners should be inspected and cleaned
(if required) by a qualifi ed service technician annually
to ensure continued safe operation. Pay attention to any
deterioration from corrosion or other sources.

Lubrication

The bearings in the blower motor and inducer blower used
in these furnaces are pre-lubricated and sealed by the
manufacturer. No further oiling of the bearings is required
for the life of the motor.

TROUBLESHOOTING

If the furnace fails to operate check the following:

•  Is the thermostat operating properly?
•  Are the blower compartment door(s) in place?
•  Is the furnace disconnect closed?
•  Has the circuit breaker tripped or the control board fuse

burned open?

•  Is the gas turned on?
•  Are any manual reset switches open?
•  Is the fi lter dirty or plugged?
•  Is the fl ame sensor coated? (Remove and clean with

steel wool).

• Are all the LED’s on the furnace control board constantly

ON? If not, refer to Table 3 or the wiring diagram (Figure
19, page 30) to determine fault condition.

IMPORTANT NOTE: The furnace will lock out after 5
failed attempts for ignition and will try again every
hour if the call for heat remains.

• If the inducer blower is operating and items above have

been verifi ed, check the blower limit switch and reset
if necessary. See Figure 20 (page 34) for component
location.

• If the furnace operates when the blower limit switch is

reset, contact a qualifi ed service technician to identify
and repair the problem.

• If the furnace still doesn’t operate, check the fl ame

roll-out switch and reset if necessary. See Figure 20
for component location.

• If the furnace operates when the fl ame rollout switch is

reset, contact a qualifi ed service technician to identify
and repair the problem.