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Old 01-04-2013, 06:48 PM   #1
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Atwood Hot Water Heater Meltdown!

Hi Everyone,
I woke up this morning to no hot water, after trying to reset it several times I went outside to find all the wires melted? Any idea how this happened or what I can do to prevent it from happening again. I will finish in the morning replacing all the burned wires but I do not know what to do to shield the heat from them. I can only tuck the wires so far out of the way.
Here are the pics,











Thanks for any advice giving!
Leon
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Old 01-04-2013, 06:59 PM   #2
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w/h melt down

i would suspect a spider or earwig web blocking the burner tube looks like the wire damage is directly above the air vents on the burner tube
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Old 01-04-2013, 07:19 PM   #3
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Yes the wires were above the burner vent tube. it also looks like there has been a flame burning at the vent. So you think that would have caused this?
Thanks,
Leon
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Old 01-04-2013, 07:36 PM   #4
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There is supposed to be a thermal fuse in a clear plastic tube that is supposed to prevent this situation. I don't see it in any of your pictures.
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Old 01-04-2013, 07:50 PM   #5
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I did find in a box several months ago a clear tube with what looks like some type of fuse inside with an electrical connector. I still have it and will get it tomorrow. I guess if it is not installed then it must be blown (do thermal fuses blow), if so do you know where I can get another one?
Thanks
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Old 01-04-2013, 07:53 PM   #6
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I found new ones on the internet and a picture as to which wire that it goes on. Thank you!
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Old 01-05-2013, 10:16 AM   #7
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Fuel/Air mix

Wow, you're either at 20,000 feet or that is one heck of a lean condition in your burner. And that would certainly cause too much heat for the system to handle.

The manual describes what a healthy flame should look like but I 'tune' mine by sound. If it sounds like a jet taking off it's too lean. I get it just to the point that it starts to 'whoosh' and the flame looks perfect.

Check for bugs & debris in the burner tube AND the outlet. There are brushes made that will go through the entire system but there are other ways to do it in a pinch. I've used a plumbers snake.....
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Old 01-05-2013, 02:18 PM   #8
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All fixed and I found the problem, I think. No webs or anything but my Air Shutter was wide open and I had a loud wosh sound. There was a flame at the air shutter and in the tube. I blew the flame out of the air shutter for it only to return. I found in the manual to set it at 1/4" and that seems to prevent the sir shutter from burning. The flame seems to be burning blue at first and then turn to a yellow. If I open the shutter more then the flame comes out of the shutter. So for now I will leave it at 1/4". Any thoughts?
Thanks,
Leon
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Old 01-05-2013, 02:25 PM   #9
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Thanks for the update. Others will learn from this. Glad you got it taken care of.

Cliff
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Old 01-05-2013, 02:30 PM   #10
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Good advice on thermal fuse , your lucky the burnt cables didn't head back into the coach .
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Old 01-05-2013, 02:38 PM   #11
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Oh I found the thermal fuses online and ordered a set of 2. But I went by RadioShack and they carry them for only $1.99 plus the connectors and a little heat shrink. So I am now protected.
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