Page 12 of 16
506941-01
Issue 1148
Outdoor Coil
Dirt and debris should not be allowed to accumulate on the
outdoor coil surface or other parts in the air circuit. Cleaning
should be as often as necessary to keep coil clean. Use a
brush, vacuum cleaner attachment, or other suitable means.
If water is used to clean the coil, be sure the power to unit
is shut off prior to cleaning.
Care should be used when
cleaning the coil so that the coil fi ns are not damaged.
Do not permit the hot condenser air discharge to be
obstructed by overhanging structures or shrubs.
Burners
To clean the burners, fi rst remove them from the furnace as
explained in Burner Instructions on page 9. Vacuum and/
or brush as required.
Vent Outlet
Visually inspect vent outlet periodically to make sure that
there is no buildup of soot or dirt. If necessary, clean to
maintain adequate opening to discharge fl ue products.
Heat Exchanger
With proper combustion adjustment, the heat exchanger
of a gas-fi red furnace will seldom need cleaning. Sooting
of a gas appliance is highly irregular and once cleaned,
the cause of the sooting must be determined. If the heat
exchanger should become sooted, it can be cleaned as
follows:
1. Remove the burner assembly as outlined in Burner
Instructions on page 9.
2. Remove the combustion blower.
3. At the bottom of the heating section, remove the screws
holding the fl ue collector box. Carefully remove the fl ue
collector box without ripping the adjacent insulation.
4. Using a wire brush on a fl exible wand, brush out the
inside of each heat exchanger from the burner inlet and
fl ue outlet ends.
5. Run the wire brush down the heat exchanger tubes from
the burner end.
6. Brush out the inside of the fl ue collector box.
7. Clean the combustion air blower wheel and housing.
Run the wire brush down the fl ue extension at the outlet
of the vent housing.
8. After brushing is complete, blow all brushed areas with
air. Vacuum as needed.
9. Replace parts in the reverse order they were removed
in Steps 1 through 3.
10. When replacing the fl ue collector box, be careful so as
not to tear the adjoining insulation.
11. Assure that all joints on the vent side of the combustion
system are air tight. Apply a high temperature (+500°F)
sealing compound where needed.
CONTROL SYSTEM DIAGNOSTICS
Fault Codes
Table 3
LED Status
Flashing Rate
Fault
Description
Slow Flash
Fast Flash
2 Flash
3 Flash
4 Flash
5 Flash
Steady
One flash
per second
Normal operaton:
No call for heat
Two flashes
per second
Normal operation:
Call for heat
Two flashes
in second with
1-second pause
Internal failure:
Micro-controller
failure; self-check
Five flashes in
2.5 seconds with
1-second pause
Flame sensed
and gas valve
not energized
Four flashes in
2 seconds with
1-second pause
High limit or
rollout switch
open
Three flashes in
1.5 seconds with
1-second pause
Pressure switch
senses incorrect
pressure or auxiliary
limit is open, or gas
valve coil is open.
System lockout:
Failed to detect
or sustain flame
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