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035-17477-001 Rev. A (801)
All flash code sequences are broken by a 2 second "off"
period.
IGNITION CONTROL (P/N 031-01267-001)
Normal flame sense current is approximately
3.7 microamps DC (υa)
Low flame signal control lockout point is
0.9 microamps DC (υa)
CONTINUOUS FLASH:
sensed when there was not a call for heat. With this fault
code the control will turn on both the inducer motor and sup-
ply air blower. This fault would typically be caused by a gas
valve that leaks through or is slow closing.
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
mis-wiring.
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 or auxiliary limit
switch has opened its normally closed contacts. With this
fault code the control will operate the supply air blower and
inducer. This condition may be caused by: dirty filter, improp-
erly sized duct system, incorrect blower speed setting, incor-
rect firing rate or faulty blower motor.
5 FLASH: This fault is indicated if the normally closed con-
tacts in the rollout switch opens. The rollout control is manu-
ally 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 4 times during the call for heat. If
the main blower is in a "Delay on" mode it will complete it,
and any subsequent delay off period. The ventor continues to
operate until the pressure switch re-closes or a call for heat is
removed.
7 FLASH: This fault code indicates that the flame could not
be established. This no-light condition occured 3 times (2
retries) during the call for heat before locking out. This may
be caused by low gas pressure, faulty gas valve, faulty hot
surface ignitor or burner problem.
Unitary Products Group
This indicates that flame was
8 FLASH: This fault is indicated if the flame is lost 5 times (4
recycles) during the heating cycle. This could be caused by
low gas pressure or faulty gas valve.
9 FLASH:
Indicates reversed line voltage polarity. Both
heating and cooling operations will be affected. Check polar-
ity at furnace and branch.
11 FLASH: This fault will be indicated if the rollout jumper
wire connection soldered into the board, is broken. If this fault
occurs the control will have to be replaced. This fault may
also occur in installations where an improper ground is
present. Prior to replacing control, verify that unit is properly
grounded.
STEADY ON: This fault occurs if the gas valve is energized
when there is no call for heat. If this happens the ventor is
energized and will remain energized for 5 seconds or until the
fault clears itself at which point the ventor de-energizes. This
failure is counted as a recycle. Check the gas valve and con-
trol for proper operation.
60 MINUTE AUTOMATIC RESET FROM LOCKOUT:
control includes a "watchdog" type circuit that will reset from
a lockout condition after 60 minutes. Operational faults
1,6,7,8 and Steady On will be reset. This provides protection
to an unoccupied structure if a temporary condition exists
causing a furnace malfunction. An example would be a low
incoming gas supply pressure preventing unit operation.
When the gas pressure is restored , at some point the
"watchdog" would restart the unit and provide heat for the
house.
NOTE: If a flame is detected the control flashes the LED for
1/8 of a second and then enters a flame stabilization period.
Never jump pressure switch to allow furnace oper-
ation. To do so will allow furnace to operate 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.
This
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