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035-17438-001 Rev. A (901)

Unitary Products Group

CONTINUOUS FLASHING (1 sec on 1 sec off):

This indi-

cates that flame was sensed when there was not a call for
heat. With this fault code the control will also turn on both the
inducer motor and supply air blower. This fault would typically
be caused by a gas valve that leaks through or is slow clos-
ing.

2 FLASH:

This indicates that the normally open pressure

switch contacts are stuck in the closed position. The control
confirms these contacts are open at the beginning of each
heat cycle. This would indicate a faulty pressure switch or
miswiring.

3 FLASH:

This indicates the normally open pressure switch

contact did not close at the beginning of the heat cycle. This
could be caused by a number of problems; faulty inducer,
blocked vent pipe, broken pressure switch hose or faulty
pressure switch.

4 FLASH:

This indicates that a primary limit, or auxiliary limit,

or rollout limit switch has opened its normally closed contacts.
With this fault code the control will operate the supply air
blower and the ventor. This condition may be caused by: dirty
filter, improperly sized duct system, incorrect blower speed
setting, incorrect firing rate or faulty blower motor. The rollout
control is manually reset. If it has opened, check for proper
combustion air, proper inducer operation, primary heat
exchanger failure or burner problem. Be sure to reset the
switch after correcting the failure condition.

6 FLASH:

This indicates that after the unit was operating, the

pressure switch opened 5 times during the call for heat. This
could be caused by a number of problems; blocked vent or
chimney, faulty inducer, cracked pressure switch hose. Igni-
tion control will lock-out after pressure switch opens 5 times.

7 FLASH:

This fault code indicates that flame could not be

established. This no-light condition occurred 3 times during
the call for heat before locking out. This may be caused by
low gas pressure, faulty gas valve, faulty hot surface ignitor,
reversed line polarity, or burner problem.

8 FLASH:

This fault is indicated if the flame is lost 5 times

during the heating cycle. This could be caused by low gas
pressure or faulty gas valve. The ignition control will lock-out
if flame is lost 5 times.

LED ON CONSTANTLY:

This indicated an internal fault in the

furnace control discovered during its self-check procedure.
Replace the control.

60 MINUTE AUTOMATIC RESET FROM LOCKOUT
(applies to fault codes 6, 7 & 8):

This control includes a

watchdog type circuit that will reset from a lockout condition
after 60 minutes. This provides protection to an unoccupied
structure if a temporary conditions exists causing a unit mal-
function. An example would be a low incoming gas supply
pressure condition preventing unit operation. When the gas
pressure was restored, at some point the watchdog would
restart the unit and provide heat for the house.

NOTE:

The control will blink one time when initially pow-

ered. This is normal and not an indication of any malfunction

FURNACE ACCESSORIES

Never jump pressure switch contacts to allow fur-
nace operation. To do so will allow furnace to oper-
ate under potentially hazardous conditions.

Do not try to repair controls. Replace defective
controls with UPG Source 1 Parts.

Never adjust pressure switch to allow furnace
operation.

ELECTRICAL

Please see Price Pages for specific details.

*ET03700324

Thermostat, One-stage Heat/One-stage Cool, non-programmable

*ET03700124