My Ruud 90+ propane furnance started making a loud bang noise yesterday. I had a hard time figuring out where it was coming from, as it sounded like a gunshot, or a M80 noise, and it never happened when I was near the furnance.
Anyhow, now I know the source. Its a Ruud UGED model, 175k BTU, installed about 1992. When it attempts to light up, the ignitor comes on, and the drum lights with a bang, but does not stay lit, goes out in 1-2 secs.
First, it is safe to use in the meantime? I dont want to burn the house down or subject the family to CO poisoning. Second, any hints on what could be the cause? It has not been serviced in about 9-12 months, and was working fine until yesterday. I checked the inlet and outlet burner supply for obstructions, OK there, and the rest of the system appears to operate ok. I also have an emergency call in to my service provider, but its been an hour and no call back yet for advice. I was going to pull the ignitor to make sure its clean, but I doubt that will have any affect. And my last gas delivery (500 gal tank) was about 2 weeks ago. Could water contamination in the tank do this, althoug I doubt it..?
Any advice is welcome.