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Please help with old furnace
I have an old original Coleman furnace, 1986 vintage, and the pilot light keeps going out, rather randomly.
I've had the local heating company out to look at it twice and they are stumped. It has been fine for the last 10 years, then it started acting up about a year or so ago.
Thermocouple has been replaced twice. Once lit I can remove my thumb immediately from the black button you depress to light the pilot and it stays lit. Always stays lit upon lifting.
Thought for sure might be the roof vent / cap as the pilot seems to dance around some when I hear the wind howl, but I don't think so. Recently we had an extremely gusty day with winds > 20 MPH and it didn't go out. Been lit for almost a week. It was out this morning tho.
From my own observations it seems to go out as the thermostat calls for heat, but not always. I asked heating guy to check the pilot light gas pressure, and I watched him do it. He said it was fine. If I recall correctly it was 14 inches of mercury.
Any chance the problem could be the main gas valve (that the thermocouple screws into)?
When the furnace kicks on it made a howling noise for a short while (30 seconds to a minute roughly). There is a rod that the heating company says controls the air intake. He made an adjustment to that, watching the flame thru the burn window to what he thought was a good quality blue flame, and that howling went away. I actually think the pilot goes out more now than before, but actually its so random (it can go for days, but sometimes I'll wake up to a cold house after lighting it the previous day) its hard to say for sure. It stayed lit all summer long this year, didn't need to light it.
I live in a 1986 mobile home, and can't afford the cost to replace the heating. I'm quite the do it yourself kindof person and thought about trying to retrofit an electronic igniter to replace the pilot, but aside from the safety concerns it would be tough on such an old system.
Any input on things to check or suggestions are welcome.