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Open Roads Forum  >  Class A Motorhomes

 > Atwood water heater lights then goes out

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Paul Turpin

Surprise,Arizona / Cincinnati,Ohio

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Posted: 08/25/09 04:52pm Link  |  Print  |  Notify Moderator

I have an Atwood 10 gal electric/gas water heater in a 2004 Pace Arrow. When I turn it on propane it lights for a few seconds, goes out then lights then back off three times then stays off with the red warning light on. I then start it again and this time it will light and run normal. As long as I leave the water heater in the on position it will work normal for weeks. But, if I turn it off and then turn it back on it will go through this again.
I am going to start looking for the problem in a few days and would like any ideas what things to check for.


Paul and Sue
2004 Pace Arrow 37C
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Hoppers4

Port Orchard, WA

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Posted: 08/25/09 05:22pm Link  |  Print  |  Notify Moderator

My first RV water heater would stay lit on the third try. This RV takes 4 or 5 tries to stay lit (after sitting for a week or so). I never really considered it much of a problem. The voltage level put out by the detector is so low (a few millivolts) that it doesn't take much wire/connector resistance to fall below the detection range.


08 Winnebago Sightseer 29R

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Posted: 08/25/09 09:55pm Link  |  Print  |  Notify Moderator

I had the same problem for the last three years....someone here told me to check my ground.....I cleaned it and it has been fine all year.





chasfm11

Dallas/Ft Worth Areas

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Posted: 08/25/09 08:19pm Link  |  Print  |  Notify Moderator

My guess would be that flame sense is failing. The control board opens the gas valve, fires the igniter and waits for the igniter to confirm that there is a flame. If that doesn't happen in about 2 seconds, the control board closes the gas valve and, if there was a flame, it goes out.

I'd start by taking the igniter connector off the board and clean the contact with a pencil eraser. When I had the same symptom as you (mine is a 6 gallon though) and parts were 70 miles away, I bought both the board and the igniter. The igniter didn't fix it but the board did. Mine was a bit more of a solid failure than yours. You've probably got a 50/50 shot on cleaning the contact fixing it.


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ricardo

Fort Wayne Indiana

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Posted: 08/25/09 08:44pm Link  |  Print  |  Notify Moderator

recentlhy had this exact problem. Took a look and ended up blowing out the the "flow tube-flame tube"? It seems that spiders like the propane and while I didn"t see an obstruction everything ran fine afterward. Give it a try.


Rick and Sandy
2010 American Tradition 45ft
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horizon36

Henderson, NV

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Posted: 08/25/09 07:04pm Link  |  Print  |  Notify Moderator

It could be the thermal cut off. They are cheap to buy and you can replace it yourself. Call Atwood to get a replacement. Here's a link to one of their manuals: Link


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Anml_341

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Posted: 08/26/09 06:16am Link  |  Print  |  Notify Moderator

Two suggestions:
One: with a hair dryer or compressor, blow out any of the rust, ash, or other junk in the burner area. Easy to do and worth a try. (suggest doing the same thing with the furnace)
Second, if you think there may be spiders, try attaching a section of a pet flea collar in the compartment (For whatever reason, the spiders do not appear to like it and stay away.) Replace annually. Again, easy and inexpensive.

Worth trying and might save the day as the saying goes...


Frank Spence
Ontario Canada
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