31
• L 6 F
•
•
• L 6 F
Normal operation
Normal operation
None
Replace or realign igniter
start of heating cycle
as necessary
needed
Primary limit circuit is open
filters or remove obstruction
Insufficient conditioned air over the
necessary
Correct short at flame sensor or in flame sensor
Short to ground in flame sense
circuit
gas valve
minimal
in burner fame
Compare current gas pressure to rating plate
Induced draft
no furnace
operation
necessary
runs continuously
No furnace
operation
Induced draft
runs continuously
No furnace
operation
operation of gas valve
for proper flame sensor alignment
gas pressure or combustion air