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Old 07-12-2016, 11:57 AM   #1
Junior Member
Join Date: Apr 2015
Posts: 4
Water Heater blowing fuse

Our 2005 Fleetwood Discovery randomly blows the 12v, 15 amp water heater fuse located below the bed, only on the first power up. Replace the fuse and all works fine for the duration of the camping.

Next time we're out camping, it may or may not blow the water heater fuse.....we never know.

It doesn't matter whether I turn on the propane first or the camp electric first. Randomly blows the fuse!

Very frustrating. Again, replace the fuse and all works fine for that camping sesson

For you electrical experts: I'm thinking something is going wrong with the igniter ...... have you guys seen this behavior before? Maybe the in-rush current overwhelms the fuse?

Thanks in advance for any help you can offer.


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Old 07-13-2016, 01:45 PM   #2
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Join Date: Jan 2012
Location: Cincinnati
Posts: 17,837

A fuse blows when the amperage draw exceeds it's capacity. This happens if the fused circuit has too big a load on it or a short circuit occurs which would instantly cause too much current flow.

I doubt if a properly working water heater would suddenly draw more current than it needs. I would suspect a short circuit. I'd check the wires and connectors in the wiring to the WH, I think you'll find a bare connection or stripped insulation.

Bob & Donna
'98 Gulf Stream Sun Voyager DP being pushed by a '00 Beetle TDI
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fuse, heat, heater, water, water heater

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