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RWWIEFER

Arizona

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Posted: 03/23/20 02:57pm Link  |  Quote  |  Print  |  Notify Moderator

Newbie to this forum, not new to RVing.
I just purchased a pop up truck camper, 1996 Skamper #080.
Need some help with the furnace. It looks rarely used. Will not fire off/lite., Hookup to house power, has an on-off switch before gas valve (turned on) Gas on and full, cracked gas fitting at valve to verify propane-yes. Turn t-stat up to 90 and a few seconds later the blower kicks on as its suppose to. 6 seconds later the double solenoids both click to ope gas valve (But does light. I can can faintly here the valve close I believe. Re-set t-stat multiply times with no luck. Going through the same procedures with a VOM, I do have 10.9 volts hitting the coils, the wire coming off the circuit board has 13 volts going to the igniter. After the few seconds the only thing running is still the fan. Which manual says it will lock out. Any pointers before taking it to a shop. I am mechanically incline so I can do any of the work myself if needed but don't want to start buying valves etc just yet.

naturist

Lynchburg, VA

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Posted: 03/23/20 03:18pm Link  |  Quote  |  Print  |  Notify Moderator

The most common problem is a burner tube full of spider webs, mud-dauber nests, or dead stink bugs. Clean that thing out and if that doesn't do it, the most common part to fail is the thermocouple that ensures that the burner lights and stays lit while the gas valve is open. It is a cheap, easily replaced, and generic part. Last one I replaced cost like $5 at Lowes. Before you give up and take it to the tech who will charge you big bucks, it is worth just replacing that thermocouple out of hand.





RWWIEFER

Arizona

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Posted: 03/23/20 03:25pm Link  |  Quote  |  Print  |  Notify Moderator

Thank you, if it matters the furnace is a Everest Star 7900 II

midnightsadie

ohio

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Posted: 03/23/20 05:56pm Link  |  Quote  |  Print  |  Notify Moderator

curious why only 10v at the coil?

ajriding

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Posted: 03/24/20 09:35am Link  |  Quote  |  Print  |  Notify Moderator

anecdotal, but on my furnace the valve body went bad, so I had to replace the whole part. If it is old that could be possible too. Check the spiderwebs first though.
Have you seen the diesel heaters sold on ebay for about $150? They might be cheaper than fixing the propane one. They should use less battery power also.

profdant139

Southern California

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Posted: 03/24/20 09:44am Link  |  Quote  |  Print  |  Notify Moderator

If you have trouble reaching the burner orifice, you can sometimes use an air compressor to blow out the debris. Harbor Freight usually carries a narrow extension wand that fits onto the air hose so you can reach into tight spaces. Good luck!


2012 Fun Finder X-139 "Boondock Style" (axle-flipped and extra insulation)
2013 Toyota Tacoma Off-Road (semi-beefy tires and components)
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midnightsadie

ohio

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Posted: 03/24/20 12:32pm Link  |  Quote  |  Print  |  Notify Moderator

take that gas valve apart and clean or replace. you here the click?? is there gas on the exit side of the valve??

mchero

Henniker, NH

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Posted: 03/24/20 03:04pm Link  |  Quote  |  Print  |  Notify Moderator

https://techsupport.pdxrvwholesale.com/technical-service-manuals/atwood-7900-ii/Everest Star 7900

* This post was edited 03/25/20 05:22pm by mchero *


Robert McHenry
Currently, Henniker NH
07 Fleetwood Discovery 39V
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2005 Jeep Grand Cherokee
Prior:1993 Pace Arrow 37' Diesel

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