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Old 11-20-2012, 06:36 PM   #15
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Originally Posted by blkmagikca View Post
If by "fuse" you mean the thermal cut-off which is located on the water heater just a couple of inches above the burner, then the reason it blew was because there is some obstruction in the burner tube, such as a spider's nest. It has to be cleaned out. or the next thermal cut-off you use will blow.

The purpose behind the thermal cut-off is to prevent ignition outside of the burner tube that could lead to possible fire damage to your camper. When your camper is in storage, or not being used, spiders are attracted to places where there is propane, such as burner tubes in hot water heaters, refrigerators and furnaces. You need to clean their webs out, which can easily be done with compressed air.
I did clean out the burner tube, although it was subsequent to the fuse blowing. I didn't see anything escape, although it could have been the original problem; no way to know at this point.

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Old 11-20-2012, 11:21 PM   #16
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That is the only way for the thermal fuse to get fire on it... what happens is the burner tube gets a small obstruction, and the flame will back up and come out the air-mixture tube (that little piece you can slide to fine-tune the flame).

The only other alternative is if something is cracked in the propane supply... in which case you'll find out right away when it burns another fuse.

I was pretty PO'd at mine water heater, and previous owner, as mine did this - until I found the simple fix and maintenance required. Poor design overall really...

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Old 11-21-2012, 08:37 AM   #17
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There are screens available that go over the water heater and furnace exhausts. That keeps out most of the bugs.


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