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Old 06-11-2021, 11:54 AM   #1
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Thermal cutoff

I have an Atwood MPD93809 hot water heater that fried the thermal cutoff. Can I use the water heater if I monitor it while itís running until I get a replacement? Iím pretty certain itís that since when I remove it and connect direct it fires up right away.
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Old 06-11-2021, 07:31 PM   #2
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Thermal cut out is for Flame Blow Back protection

Blow back is from an obstructed/dirty burner/orifice and /or combustion chamber

Thermal fuse blows when exposed to 190*F temps


YES you can operate the water heater w/o thermal fuse in place
Better yet....do a quick cleaning of burner tube
And pay attention to FLAME when it fires off

**Suburban doesn't have/use a thermal fuse....but no of the circuit boards or t-stat wiring is exposed to flame blow back like the Atwood
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Old 06-12-2021, 08:41 AM   #3
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Old Biscuit is right but you need to clean the burner first. If you use it without that flashback safety device you could start an RV fire.
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Old 06-12-2021, 11:13 AM   #4
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RV Fire.......??

More likely to just burn up the circuit board/wiring which would cause loss of DC circuit and Gas valve snapping closed....no more flame
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Old 06-14-2021, 11:34 AM   #5
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Old Biscuit,

Thank you. This was a very timely post. My son just had his thermal fuse blow on his new travel trailer. Dometic WH-6GEA

I have passed on your comments and will add to this post if something unique turns up.

BTW, your past comments on Winnebago’s use of check valves helped me fix my WH this spring.

So thanks again.
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Old 06-14-2021, 12:09 PM   #6
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Quote:
Originally Posted by JoeSR View Post
Old Biscuit,

Thank you. This was a very timely post. My son just had his thermal fuse blow on his new travel trailer. Dometic WH-6GEA

I have passed on your comments and will add to this post if something unique turns up.

BTW, your past comments on Winnebagoís use of check valves helped me fix my WH this spring.

So thanks again.
That Dometic WH6-GA is a brand NEW version
Dometic redesigned it.....combustion/exhaust stack in center and electric element added to front in lower right corner
**No more Atwood support

With combustion/exhaust stacked the Thermal Fuse/T-stat & ECO are located Between them so any obstruction in combustion/exhaust U tube can cause blow back
Even just spider webs etc

*Just under the Bracket in center for door latch
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