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Old 11-09-2012, 04:32 PM   #1
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Tiffin Owners Club
Join Date: Jan 2012
Posts: 105
furnace: no heat, cycles on then off

Hello. 2004 Allegro Bay: My front furnace began cycling on & off a few nights ago, rather than taking a minute or so to shut off after desired temp was achieved. Now won't turn on to heat, no matter where I adjust the thermostat. LPG 2/3 full. (Heat pump seemed to be working, but air feels cool when thermostat set at 75°.)
Seems like I cannot hear a gas pilot lighting for the furnace, but stove ok.
Any ideas? Lots of leaves outside, temps dropping to 32° @ night now. Air pocket? Something clogged?

I just came out of abdominal surgery & will likely need to call someone, but would like an idea first of what may be going on.
Ms. Tealstar

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Old 11-09-2012, 04:40 PM   #2
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Location: Manhattan Beach, CA
Posts: 653
The air flow may be low. There is a 'sail' switch that has to close before the gas vale will open. Is there a air filter on the intake of your furnace or is the screen dusty?

Steve & Jeri
2004 Dolphin 5342
2000 Jeep Cherokee 4X4
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Old 11-09-2012, 05:21 PM   #3
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Old 11-12-2012, 12:59 PM   #4
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Pull the fuse from your thermostat, wait a few seconds then put the fuse bacsetk. this worked for me. Good luck.
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Old 11-19-2012, 05:56 AM   #5
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Ford Super Duty Owner
Join Date: Feb 2006
Location: Idaho
Posts: 192
I'm sure you have your furnace fixed by now and I don't know your make or model but I have some trouble shooting information that I found online and will forward information and links if you send me a PM. Actually furnaces are quite simple but don't attempt to work on them if you don't understand the operation timeline, have multimeter, mechanical knowledge, or correct tools. There are only a few things in the system and if the sequence is broken by just one it won't light (thermostat, delay, sail switch, limit switch, and valve). Even if you don't work on them it is reassuring to understand the furnace or any system so you don't panic when it doesn't work.
2013 Winnebago Aspect 27K
Lives in South Western Idaho
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