1. To retrieve fault code proceed with the following:
NOTE: NO thermostat signal may be present at control center
and all blower time delay off periods must be completed.
a. Leave 115-v power to furnace turned on.
b. Remove main furnace door.
c. Look into blower access panel sight glass for current
LED status.
d. Remove blower access panel.
e. Turn setup switch SW-1 to ON position. (See Fig. 13 or
17 for location.)
f. Manually close blower access panel door switch. Use a
piece of tape to hold switch closed.
WARNING: Blower access panel door switch opens
115-v power to control center. No component operation
can occur. Caution must be taken when manually closing
this switch for service purposes. Failure to follow this
warning could result in personal injury or death.
g. LEDs display last fault code to occur first, followed by
any other fault that has occurred in the last 5 "good or
proper" cycles. The remaining faults displayed will be in
numerical order starting from the lowest number first.
Only 1 of each fault code will be displayed, regardless of
how many times the fault has occurred.
h. Fault code display will continue and repeat as described
above or until setup switch SW-1 is turned off.
i. Release blower access panel door switch and replace
blower access panel.
j. Operate furnace through 1 heat cycle to test for proper
operation and check LED status.
k. If furnace is operating properly and LEDs indicate
proper operation, replace main furnace door.
2. Fault code display can be removed from control’s display
mode by performing the following. This is also called the
"Clean Up Procedure."
a. Leave 115-v power to furnace turned on.
b. Remove main furnace door.
c. Look into blower access panel sight glass for current
LED status.
d. Remove blower access panel.
e. Turn setup switch SW-1 to ON position. (See Fig. 13 or
17 for location.)
f. Jumper thermostat terminals R, W, and Y on control
center.
g. Manually close blower access panel door switch. Use a
piece of tape to hold switch closed.
WARNING: Blower access panel door switch opens
115-v power to control center. No component operation
can occur. Caution must be taken when manually closing
this switch for service purposes. Failure to follow this
warning could result in personal injury or death.
h. After fault code 11 flashes for at least 2 times, remove R,
W, and Y jumpers.
i. Turn setup switch SW-1 to OFF position.
j. Release blower access panel door switch and replace
blower access panel.
k. Operate furnace through 1 heat cycle to check for proper
operation and check LED status.
l. If furnace is operating properly and LEDs indicate proper
operation, replace main furnace door.
3. The control can also assist in troubleshooting by performing
a Component Test. The Component Test will functionally
operate all furnace components, except the gas valve.
a. To initiate Component Test proceed with the following:
(1.) Leave 115-v power to furnace turned on.
(2.) Remove main furnace door.
(3.) Remove blower access panel.
(4.) Turn setup switch SW-6 to ON position.
(5.) Manually close blower access panel door switch.
Use a piece of tape to hold switch closed.
WARNING: Blower access panel door switch opens
115-v power to control center. No component operation
can occur. Caution must be taken when manually closing
this switch for service purposes. Failure to follow this
warning could result in personal injury or death.
b. When items (1) through (5) above have been completed,
the following will occur:
(1.) The control center goes through a brief self test.
This self test takes approximately 2 sec to complete.
After door switch is closed, red (microprocessor)
LED briefly comes on. Then green LED comes on
for 1 sec, followed by 1 sec where both the green
and yellow LEDs are on. During this time, the
control is checking itself out.
(2.) Inducer motor operates for 20 sec at low speed,
operates for 20 sec at high speed, then turns off.
(3.) Hot surface ignitor is energized for 15 sec, then
de-energized.
(4.) Main blower motor operates for 20 sec at low
speed, operates at high speed for 20 sec, then turns
off.
(5.) After component operation test is completed, 1 or
more fault codes (11, 22, 41, or 42) will flash. See
service label on back of main furnace door or Fig 16
for explanation of codes.
NOTE: To repeat component test, turn setup switch SW-6 to OFF
and then back to ON.
c. After component test, perform the following:
(1.) Release blower access panel door switch and turn
setup switch SW-6 to OFF position.
(2.) Replace blower access panel.
(3.) Operate furnace through 1 heat cycle to check for
proper operation and check LED status.
(4.) If furnace is operating properly and LEDs indicate
proper operation, replace main furnace door.
IX. CHECK HEAT TAPE OPERATION (IF APPLICABLE)
In applications where the ambient temperature around the furnace
is 32°F or lower, freeze protection measures are required. If this
application is where heat tape has been applied, check to ensure it
will operate when low temperatures are present.
NOTE: Heat tape, when used, should be wrapped around the
condensate drain trap and drain line. There is no need to use heat
—9—
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