Suburban Furnace, drive me to drink!
Two yrs ago my furnace would not fire off, It did everything except ignite the propane. Cycles the fan for 8/10 sec. then goes into the 3 step to fire off hte propane. I could smell propane. At t...
Forum Discussion
OK...everything is working except for being able to refire.
So you have fan comes on, and get spark and main flame sometimes.
Spark electrode is center of burner, 3/16" from back of lance and 1/8" gap.
Main flame......either gas pressure is on low side (should be 11" WC with at least 50% of other gas appliances ON), burner orifice is plugged, or restriction in combustion air intake (wasp nests etc.)
Restricting the exhaust and it fires......that's a air/fuel ratio problem.
By restricting the exhaust you are limiting the about of air being mixed with gas (creating a fuel rich condition). Without the restriction you basically have a fuel lean condition.
Low gas pressure or plugged orifice
So you have fan comes on, and get spark and main flame sometimes.
Spark electrode is center of burner, 3/16" from back of lance and 1/8" gap.
Main flame......either gas pressure is on low side (should be 11" WC with at least 50% of other gas appliances ON), burner orifice is plugged, or restriction in combustion air intake (wasp nests etc.)
Restricting the exhaust and it fires......that's a air/fuel ratio problem.
By restricting the exhaust you are limiting the about of air being mixed with gas (creating a fuel rich condition). Without the restriction you basically have a fuel lean condition.
Low gas pressure or plugged orifice
