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johnschnee

Dometic furnace "Ignition Lockout Fault"

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We are on our first trip with our 2019 Fleetwood Southwind & this is the first morning it's been cold enough to need to use the Dometic gas furnace (Model # DFW D36 141); the blower runs for about 2 minutes then shuts off with the furnace never igniting. The red light blinking 3 times, then pausing for 3 seconds tells me I've got a "Ignition Lockout Fault". I suspect this is being caused by air in the line & in my 14 Bounder I would just run the gas stove burners for  few minutes & that seemed to clear the air out & the furnace would work fine. BUT, this rig has an ELECTRIC stovetop (& a RESIDENTIAL frig), so, besides powering off for 2 minutes to allow the thermostat to reset then try the gas furnace a bunch of times I can't come up with any way to clear out the air in the gas line! Any suggestions?

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That is the only way I know of.  Try http://bryantrv.com to see if they have a specific service manual for your unit for download.  Here are some links I refer to when I have furnace problems.      http://www.motleyrvrepair.com/furnaces.htm

http://beamalarm.com/Documents/troubleshooting_rv_furnace_problems.html

http://www.rvforum.net/miscfiles/Furnace_Trouble-2.pdf

http://docs.renegaderv.com/Suburban/Furnaces/FURNACE_Service and Training Manual 11-05-2015.pdf

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Daveh: Thanks for the handy info. - I'll review your attachments (& save them for later!) & make further efforts to get the air cleared from the gas lines. THANKFULLY this new rig has TWO heat pumps, so sweetie-pie will be cozy & warm in the meantime!

THANKS!!! 

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Vern,

Boy, that was the ticket! I ran the hot water heater on LP for about 1/2 hour (ran out most of the hot water so's it would run continuously) & then tried the gas furnace: BINGO - it lit right up, 1st time! THANKS! 

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I am sure that Vern was thinking of air not yet vented from your propane lines. You may experience this if you run completely out of propane as well. When you first change bottles or if you have had the propane turned off for an extended period, I always start by lighting the stovetop burners, first one until it burns steady, then all of them for a couple of minutes. From there I go to the water heater and sometimes it will take several tries. Next comes the furnace and last the refrigerator. 

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On some RV LP Gas fridges I've owned (in case you cant bleed air using a stove or water heater etc) after I change a gas bottle or run out and refill etc. and turn the fridge back on to gas and there's air in the lines, it may try to light a few times and fail then lock out and stop further tries. However, if I turn it back OFF and wait and then back ON (resets) it will repeat the try to light cycle and often light the second time.

John T  NOT any fridge expert but this usually works for (the many) fridges I've owned.

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 It may have been close to start on its own. Just when you give up on what are doing it may have just ready.

 On a furnace ,water heater or fridge board it will reset just by turning it off then on again.

 

 Now what is frustrating is the reset of an inverter. They may reset while cleaning battery terminals.   Sometimes it takes 24 hrs to be reset. Once on an inverter from the early 90s it took removing the negative lead to do a 24 hrs reset .

 That one I thought was toast. But it worked.

 

 Some day I am going to retire,.   Vern

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My fridge is last in line from tank. Turning on burners helps get the gas part way but usually crack the line at fridge. I am always afraid the igniter is going to die from so many attempts to start and me turning off and on to reset.

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11 hours ago, beemergary said:

I am always afraid the igniter is going to die from so many attempts to start and me turning off and on to reset

Gary, those ignition systems are "fairly" reliable. Its basically a step up HV coil/transformer that receives pulses and the ignitor tip sparking to light the gas. I've encountered more ignitor tip failures (cracks, carbon traces, shorts, mis adjustments) or control board failures then the HV ignitor coil/transformer itself. However, I agree with you the fewer times the system has to initiate the better lol. While I have also cracked lines to bleed air, I'm always hesitant to place wrenches on those fragile lines, fittings and fixtures. Hey whatever works for someone is a way to go.

Nice chatting with you

John T  

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