035-14527-000 REV A (599)
Form 650.77-N3U
Unitary Products Group
27
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. This
could be caused by a number of problems; blocked vent or
chimney, faulty inducer, cracked pressure switch hose.
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.
LED ON CONSTANTLY:
This indicated an internal fault in
the furnace control discovered during its self-check proce-
dure. Replace the control.
60 MINUTE AUTOMATIC RESET FROM LOCKOUT:
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 malfunction. An example would be a low
incoming gas supply pressure condition preventing unit oper-
ation. 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 powered.
This is normal and not an indication of any malfunction.
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.
