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Old 01-20-2011, 12:43 PM   #11
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Re: furnace qs

Pics are up. Hope it helps.
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Old 01-20-2011, 05:29 PM   #12
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Re: furnace qs

I used a soft small paint brush to brush the rust dust off the orifice on our furnace. As for the term "igniter". I'm not sure of the correct name but it's the thingy that makes the sparky thing that lights the metal thingy that the LP comes out of. Now which makes more sense? My previous post or this one? And if you say this one Smitty, It will be proof positive that you have been in the cold too long!

The wire is to clean the honeycomb metal in the burner


This is my "sparky thingy"


The pics are in one of my photobucket albums. I did not want to post them all here. A little more info is on the pics under "description".
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Old 01-20-2011, 11:38 PM   #13
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Re: furnace qs

Quote:
Originally Posted by Smitty
... They do some funky stuff in RVs
Oh yes they do! Drives us nuts. It's a short trip.
Quote:
Originally Posted by Smitty
... Matter of fact, from best I can tell from your pics, your furnace doesn't have a pilot light, does it?
No, the furnace does not have a pilot light. While I have no problems with LP and have cooked/heated with LP for most of my life, I do not like pilot lights. To me, LP is not dangerous, but PILOT LIGHTS are. Happily, my furnace is direct spark which was dumb luck... just like after we painted the interior of the RV blue, yellow with white trim, the awning (with a metal weather shield) was unrolled to reveal... blue, yellow and white stripes! Which just reinforced my daughters decision that I am a witch (lots of coincidences in my life... and they think I can read their minds ). We replaced the water heater with one that has a direct spark. and of course the RV range has no pilot light on cooktop but the oven does (which I turn on and light the pilot when ever I have to use the oven). My oven for the bus, which is sitting inside the bus right now... it was my oven from home, has no pilot light (piezo-electric). Requires 110vAC to light the oven but if need be, I can light the cooktop with a match (handy during a power outage).
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Old 01-27-2011, 03:36 PM   #14
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Re: furnace qs

Sounds like you're not getting propane into the combustion chamber.

I had a similar problem with an Atwood Everset Star furnace recently. When bench testing it, I could hear the fan running then, a few seconds later would hear the snap, snap, snap of the spark ignitor working. No heat though. Turned out there are two solenoid coils on the front of the gas valve and one was bad so the gas valve wouldn't open. I'm assuming you've actually got propane in the tank and the regulator is working properly. To test that, take the tank outside and open the valve a bit. You should hear a low hiss and be able to smell the propane gas.

You don't mention which furnace you have but on the atwood there are two black, cylindrical parts on the lower front of the gas valve (solenoids). There are wires attached to both of the soleniods and if one solenoid is bad the valve won't open. To test the solenoids unhook the wires (marking where each goes) and check both with an volt meter set on continuity. If one is open (no continuty) there's your problem.

The newer furnaces have a computer board that controls the combustion process. In general, if you hear the ignitor snapping you can be fairly sure that everything up to that point is OK. I.E. you have 12v power, the t-stat is calling for heat, the combustion fan is working, the PC board is OK, and the ignitor is working. The snapping sound you hear is the spark jumping across the electrodes.

What should be happening after the ignitor snaps is 1) propane gas ignites 2) the flame sensor signals a good flame and 3) the high limit sensor reports combustion chamber temps are within range.

From what you've said, I'm betting on the gas valve as the culprit.
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Old 01-27-2011, 08:53 PM   #15
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Re: furnace qs

Quote:
Not exactly, it's simply a switch that opens on a temp rise (overheat) to cut-off the gas valve (burner). This prevents a burner from continuing to burn in the event of say a blower motor failure, and the furnace going into melt-down.
Picky, picky, picky (but accurate).

BTW Smitty, great catch on your recent battery connections post.
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