repairing Uhaul furnace - Page 2 - Fiberglass RV


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Old 10-09-2010, 08:49 PM   #15
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Trailer: 1985 U-Haul CT13 ft ('The Mothball')
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Bruce,
From my minimal knowledge of our furnaces I wonder if it is the dinosaur board. This is the thing I show myself changing in the pictures in this post. My furnace did the same thing - would light for a few seconds and then the flame would die out. It seems like the board controls the continuation of the flame, among other things. Someone knowlegable on this, please pipe in.
While I just took the board out of Karen's furnace (and the verdict is still out as to whether it is working for me - it could be the board and not the thermostat that is malfunctioning and keeping it on all the time - will try to work on it during this long weekend - the real Thanksgiving ) you can also buy a new board. They are called dinosaur boards, and I might be ordering one, we'll see.

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Matt (or anyone)...when I picked up my uhaul last year the furnace wouldnt light and then it did after a few days.i thought it had something to do with my charging the battery but I guess not.....now mine cycles through like its gonna light but doesnt.......any idea's? and can I take it out and bring it to a heating and ac joint or will they be lost?......thanks bruce
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Old 10-10-2010, 06:46 AM   #16
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Matt....yes the fan runs and the thermostat works...Bridgett.thanks for the link..I guess i better get diagnosing and get whats needed..it was cold here in that thing friday!.......Bruce
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Old 10-13-2010, 03:38 PM   #17
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flame rod

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Matt (or anyone)...when I picked up my uhaul last year the furnace wouldnt light and then it did after a few days.i thought it had something to do with my charging the battery but I guess not.....now mine cycles through like its gonna light but doesnt.......any idea's? and can I take it out and bring it to a heating and ac joint or will they be lost?......thanks bruce
sounds like the board does not recognize the flame has lit. Solution for this is to clean the flame rod with 000 steel wool and make sure it is situated in the flame. The flame retification system requires good grounds so you also want to check the connection to the rod, the wire, and the connection to the board to ensure they are clean, snug and sound.

It's critical that polarity of power source is correct.
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Old 10-15-2010, 12:28 PM   #18
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there's no flame to recognize...it doesnt light ....at times i see the sparking where its trying to light something and thats it now...Bruce
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Old 10-15-2010, 07:16 PM   #19
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sparking

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there's no flame to recognize...it doesnt light ....at times i see the sparking where its trying to light something and thats it now...Bruce
when I picked up my uhaul last year the furnace wouldnt light and then it did after a few days.

As you are able to view sparking and no flame, and as it did work last year after trying multiple times, I would purge the gas line to the furnace. You can follow the line back to the next appliance nearest the furnace, light that appliance and fire for a minute, then cycle the furnace a few times till it lights. OR loosen the gas line at the gas valve and purge gas to atmosphere. (Only talking a little ...10 sec.) Ventilate well, no nearby sources of ignition. (against gas code, considered not safe practice with out use of approved purge burner) (propane heavier than air will want to fall out open door.)

If your hearing is good, you should be able to hear gas flowing/hissing out at burner as you view the sparking. If not flowing, burner oriface may be obstructed and require cleaning. ie: spider webbing. Hope that helps...
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