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Old 11-24-2015, 03:22 PM   #21
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Originally Posted by twojump36 View Post
This is the first time I've had the outside cover off the Motorhome... it was just to winterize it and drain the water heater. The thing still works.
We have camped at the Oregon Coast and it gets wet, and wet and windy....
I can say it was very windy once (80 mph winds) in September but nothing that wild since. We turn off all the switches inside on the panel before we drive the coach.
I have never turned off the propane bottle at the tank. I've only filled it once. I don't think it was caused by anything I've done. I don't believe there are any spiders in the thing but I'm not taking it apart to look either.... The dealer can deal with that.
I'm starting to figure out this Motorhome though... I think it might be a lemon?
The stereo didn't work
The TV quit working,
The Heater stopped working
The back storage compartment leaks
Now this...
I'm guessing it likely happened during the 80 mph winds and you just now noticed it.
I've had several campers that wind gusts blew out the WH flame. Luckily it didn't cause this same kind of damage.

When the weather turns that nasty, switching the WH off or to electric is just another thing to add to the list of things you can't do in severe weather.
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Old 11-24-2015, 03:23 PM   #22
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I don't know if this would cause it but we had a problem with stink bugs getting in our line. We did not know it and when the water heater came on, there was smoke pouring out - all of the stink bugs that had crawled in there burned up. Also, twice we had a stink bug in our check valve for the black tank flush behind the shower wall which caused water to leak. When we went to buy a new check valve, another customer came in with a clogged check valve and I tapped it on the counter and a stink bug came out! Stink Bugs!!!!!
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Old 11-24-2015, 04:02 PM   #23
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Originally Posted by twojump36 View Post
This is the first time I've had the outside cover off the Motorhome... it was just to winterize it and drain the water heater. The thing still works.
We have camped at the Oregon Coast and it gets wet, and wet and windy....
I can say it was very windy once (80 mph winds) in September but nothing that wild since. We turn off all the switches inside on the panel before we drive the coach.
I have never turned off the propane bottle at the tank. I've only filled it once. I don't think it was caused by anything I've done. I don't believe there are any spiders in the thing but I'm not taking it apart to look either.... The dealer can deal with that.
I'm starting to figure out this Motorhome though... I think it might be a lemon?
The stereo didn't work
The TV quit working,
The Heater stopped working
The back storage compartment leaks
Now this...

Sounds about normal. Next month you will have a whole new list of things that need fixing. Good luck with the WH. Let us know what the dealer says.
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Old 11-24-2015, 07:29 PM   #24
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I showed the picture to the dealer today and they said it's probably spiders....
I don't know how a spider got through there because of the screen over the cover, but I believe this may be their way of saying it won't be covered by warrantee.
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Old 11-25-2015, 05:49 PM   #25
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My suspicion is a shorted gas valve coil.
Brown (burned) wire provides 12V from control board (on back of heater) to both coils visible on the gas valve. This wire comes through a hole below, behind and to lower left of valve. Since this wire passes very close to both the upper (ECO/120V thermostat and 12V thermostat) and lower (120V element connections) plastic covers, if the brown wire got hot enough to burn, it would have scorched both covers. A shorted gas valve coil would have causes excess current and overheating of this wire.

If the problem had originated behind the upper cover, it should have burned completely through this plastic cover before the brown wire's insulation burned.

It was not a flame roll-out (flame backing up through the mixing tube). Ignition of the gas/air mix takes place at the far outlet of the mixing tube. Although hard to see on picture, your gas orifice and mixing tube inlet are below and well in front of the burned wire. Other wires and plastic-potted solenoid coils are between this inlet end of the mixing tube and burned wire, would have also been burned if roll-out occurred. These do not appear damaged. In addition, a flame roll-out would have caused flame-proving sensor at outlet (far end) of flame tube to lose rectification and gas valve would have VERY rapidly shut off gas flow.

There is no missing air shutter. LP-only burners are not fitted with a shutter (natural gas and convertible burners are, however). If gas pressure is correctly set (11 IWC), a venturi effect draws in exactly the correct amount of air for complete combustion.

"spiders" are a problem when they block the tiny orifice that meters gas into the mixing tube. This orifice is at the inlet end of the mixing tube. Blocking the orifice prevents the ignition of the air/gas mixture (either there is no gas available, or the mix is far too rich to burn). A flammable concentration does not develop because the flame-proving sensor at the tube outlet will closes the gas valve after a short "trial for ignition" interval. (It tries to ignite a total of 3 times only - the control module will lock the heater off (gas side only), and you have to cycle the 12V ON-OFF switch to clear this lockout).
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Old 11-26-2015, 07:09 PM   #26
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Had a similar problem with my Atwood wh. Fixed and replaced all burned items and there was no blockage or bug problem.
All I can assume for the cause was the bug screen on the wh restricted the air flow and caused the flame to fry most of the electronics. Took off the bug screen and it has been perfect for the whole season. Seems like the air flow is very important to the proper funtion of the wh.
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Old 12-18-2015, 04:58 PM   #27
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Update:
The dealer has completed the repair.... all they did was replace the wire and said it was a burn out or something?... there were no spiders in the tube. They said it happened when the gas quit going through the tube somehow?
I'm not sure how the thing works but they fixed the one burned up wire and told me I'm good to go.
I'm not so sure I have a warm and fuzzy feeling of confidence in spending the night in it for a while though.
They didn't repair the burned plastic or anything else... I suppose they tested it to make sure it was working properly....
We'll see...!
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Old 12-19-2015, 03:03 AM   #28
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Quote:
Originally Posted by twojump36 View Post
Update:
The dealer has completed the repair.... all they did was replace the wire and said it was a burn out or something?... there were no spiders in the tube. They said it happened when the gas quit going through the tube somehow?
I'm not sure how the thing works but they fixed the one burned up wire and told me I'm good to go.
I'm not so sure I have a warm and fuzzy feeling of confidence in spending the night in it for a while though.
They didn't repair the burned plastic or anything else... I suppose they tested it to make sure it was working properly....
We'll see...!
I would think they would have still replaced the valve. If I were you I would take a small piece of wire and clean the orifice. That had to happen from roll out. Those are called direct shot burners, no combustion air adjustment....Just for safety sake.....
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