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Old 10-10-2012, 07:55 PM   #1
1986 34.5' Airstream 345
Fredericksburg , Texas
Join Date: Dec 2011
Posts: 40
Heater issues

My 82 Excella has the original furnace. When it starts, it runs for 15 to 20 seconds and then BOOM! It's like a small accumulation of propane is ignited in a poof. Then the furnace functions normally. Sometimes it pops twice. I'm thinking some adjustment is necessary. Any feedback?

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Old 10-10-2012, 09:35 PM   #2
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1965 17' Caravel
1983 27' Excella
Walnut Grove/Laguna Woods , California
Join Date: Jun 2004
Posts: 1,598
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Our '83 did the same thing when we first got it a few years ago. I started checking it out, came across a bunch of rusted screws and other stuff and just replaced the whole thing.

Never been sorry. It's nearly 30 years old my friend.

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Old 10-10-2012, 11:10 PM   #3
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1974 Argosy 20
2014 20' Flying Cloud
Kooskia , Idaho
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Anything can be repaired, but furnaces are very much a safety issue, and therefor I would also recommend replacement.
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Old 10-11-2012, 12:42 AM   #4
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2008 25' Safari FB SE
Grand Junction , Colorado
Join Date: Sep 2007
Posts: 10,814
I can think of a couple of reasons for that and they may be adjustable, but I think Jim Foster is right—30 years old and time to replace the ignition system.

It would be a good time to check the heat exchanger and see it is cracked, rusted or has holes in it. It may be time to replace the whole thing.
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Old 10-11-2012, 05:54 AM   #5
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1981 31' Excella II
New Market , Alabama
Join Date: Sep 2011
Posts: 5,280
That is the normal start sequence. The fan comes on as soon as you raise the thermostat. Then a few seconds later it it opens the gas valve then starts sparking and then boom. More than likely it just needs a little cleaning. I would check the heat exchanger for holes. If the heat exchanger is ok then it just needs some R&R.

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