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50A50-241 IGNITION CONTROL (P/N 031-01266-000)
Normal flame sense current is approximately.
2.0 microamps DC ( µ a)
Low flame signal control lockout point is
0.15 microamps DC ( µ a)
6IF-2 IGNITION CONTROL (P/N 031-01267-000)
Normal flame sense current is approximately.
3.7 microamps DC ( µ a)
Low flame signal control lockout point is
0.9 microamps DC ( µ a)
All flash code sequences are broken by a 2 second "off" period.
CONTINUOUS FLASHING (1 sec "on" - 1 sec "off")
This indicates 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
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, high winds at vent terminal, broken pressure switch hose
or faulty pressure switch.
4 FLASH
This indicates the 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, improperly sized duct system, incorrect blower
speed setting, incorrect firing rate or faulty blower motor.
5 FLASH
This fault is indicated if the normally closed contacts in the
rollout switch opens. 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 combustion
air intake, high winds at vent terminal, faulty inducer, cracked
pressure switch hose, or a blockage in the condensate drain-
age system.
7 FLASH
This fault code indicates that flame could not be established.
Unitary Products Group
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 igniter 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.
POWER SUPPLY POLARITY
( W-R 50A50-241 Control Only)
If the power supply polarity is reversed, the following unit
operation will occur. On a call for heat, the inducer will run,
the HSI will glow and the gas valve will energize and the
burners will ignite. The burners will immediately extinguish
and the unit will recycle. This will occur 3 times and then the
unit will lockout. A "7" flash code will be displayed. This code
means the flame could not be established. This occurs be-
cause the control cannot sense flame with the power supply
polarity reversed.
9 FLASH (TI61F-2 CONTROL ONLY)
Indicates reversed line voltage polarity. Check incoming power
wiring.
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
This control includes a "watchdog" type circuit that will reset
from a lockout condition after 60 minutes. Operational faults 6,
7 & 8 will be reset. 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 powered.
This is normal and not an indication of any malfunction.
RESET FROM LOCKOUT
To reset the control from any lockout condition break the line
voltage supply or 24 volt signal from the thermostat for 30
seconds.
WARNING: Do not try to repair controls. Replace
defective controls with Source 1 Parts.
WARNING: Never adjust pressure switch to allow
furnace operation.
WARNING: Never jump pressure switch or rewire in
an attempt to allow furnace operation. To do so will
allow furnace to operate under potentially hazardous
conditions.
650.75-N4U
27
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