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Royal Jet Flow Gravity Furnace (OLD)

My girlfreinds house is old and the furnace is a Royal Jet Flow FG-2-55 Gravity Vented natural gas fired furnace.

I cleaned the thermal coupler and flame sensor and the furnace now burns longer and works great! Except, now when it starts the gas flows for about 1 to 2 seconds before it ignites. This causes a good flash and about a 6-inch flame flashs out of the venting. Needless to say this is not good.

did I do something wrong, or do I need to adjust the pilot flame making it larger or do I need to replace something? I tried cleaning the burner but it only worked for about two firings then it started and got worse (3 or 4 seconds) before it ignited BOOM!

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  • kcnodlr1 Nov 26, 2008

    Merle, I have the same problem and am also looking for solutions. I have been told that its, "the nature of the beast". I have purchased a new honeywell pilot assy., $80.00 bucks, and I am going to install it today. I will keep you advised as to the outcome. kcnodlr.

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  • 17 Answers

SOURCE: Gas flows to long before igniting.

try cleaning the crossovers between the burners. Also look closely at the flame and make sure that the burner is firing all the way to the pilot. Sometimes its just a few little holes that vent a little gas to give the flame a path to follow will be stopped up and cause the condition you describe

Posted on Nov 18, 2008

boysor2933
  • 293 Answers

SOURCE: Replaced pilot sensor. Still not lighting furnace. Have a high humming sound for about 2 mins then nothing. Any suggestions? Furnace is about 8 years old

The humming sound might be a stuck blower motor or a motor that won't start due to defective starting capacitor.

Posted on Nov 06, 2012

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