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Utica Propane Furnace Delayed Ignition
I have what looks to be a MGB75 LP model. Over the last few months I have been having issues of loud bangs coming from the furnace during initial start up. I immediately called in someone to look at it. Since then, there are times where it is much worse and actually shakes the house. I have seen flames shoot out of the furnace at least 12 inches during start up.
I have had professionals out 5 times now to diagnose my delayed ignition issue. None have been successful. They started by cleaning adjusting the pilot, cleaning everything and even swapping out the regulator on the furnace. The last tech that was out (Thursday) and talked with Utica tech support who suggested to turn up the manifold pressure to 11 W.C. He did that and it seemed to fire OK while he was here. A few hours later, the issue started again. It has been on and off.
Someone had asked if it could be that there wasn't enough oxygen in the basement, so I experimented yesterday but opening a window (covering with a screen) to get some more air in the furnace room, no such luck. It is still happening.
Does anyone else have any ideas that I can have the techs look at? It is getting really, really old, and this really can't keep happening.