Troubleshooting With The Led - A.O. Smith FPSE-75 Owner's Manual

LED STATUS
OFF No power to system control.
Normal Operation
BRITE - DM
This indication shows whenever the system is
powered, unless some abnormal event has occurred.
1 FLASH
Setpoint error, internal failure detected.
Airflow proving switch remains open longer than
30 seconds after a call for heat begins.
2 FLASHES
Combustion air blower is not energized
until airflow proving switch opens.
3 FLASHES
Airflow proving switch remains open longer than
30 seconds after combustion air blower energized.
System goes into 5 minute delay period, with
combustion air blower off. At the end of the
5 minute delay, another ignition cycle will begin.
Thermal Cutoff open.
4 FLASHES
Combustion air blower is energized.
Internal hardware failure.
Flame signal sensed out of proper sequence.
5 FLASHES
Combustion air blower is energized.
System Lockout.
6 FLASHES After 1 hour lockout reset delay, control will reset
and initiate a new ignition sequence if the call for
heat is still present.

TROUBLESHOOTING WITH THE LED

INDICATES
18
CHECK/REPAIR
1. Appliance On/Off switch in the Off position.
2. Line voltage input power at L1 and L2 connectors.
3. System wiring harness in good condition and securely
connected at both ends.
Not Applicable.
1. Replace control.
1. Airflow proving switch stuck closed.
2. Airflow proving switch miswired or jumpered.
WARNING
Line Voltage Hazard.
Can cause property damage, severe injury or
death.
Turn off appliance before coming in contact with
pressure switch and/or electrical connections.
1. Airflow proving switch operation, tubing and wiring.
2. Obstructions or restrictions in appliance air intake
or exhaust flue system that prevent proper combustion
air flow.
WARNING
Line Voltage Hazard.
Can cause property damage, severe injury or
death.
Turn off appliance before coming in contact with
pressure switch and/or electrical connections.
1. Replace Control.
1. Flame at main burner.
2. Replace control.
1. Gas supply off or at too low pressure to operate.
2. Damaged or broken HSI element.
3. Appliance not properly earth grounded.
4. Flame sense rod contaminated or in incorrect location.
5. HSI element located incorrect position.
6. HSI element or flame sense rod wiring in good
condition and properly connected.
7. Less than 100 Vac between flame rod and burner
pan with 120 Vac input to control.
8. Cycle external power or remove request for heat for
2 seconds and reapply.