Hot water heater issues

[Bags4266]

Hello, I have a 2021 2600rb which had a thermo fuse blown. I direct wired it and the gas worked fine. Ordered new thermo fuses and when I replaced it, it would lite but not stay on. It would try 3 times lite then go off, then the dsi fault would go on. Any ideas? Thxs

[jkwilson]

Low propane, propane tank excess flow valve tripped, propane lines need bleeding, flame sensor out of position or bad, flame out of adjustment or dirty orifice are a few ideas to check.

[Bags4266]

When I by pass the thermo fuse it works, so any propane feed issues or dirty orafice would not be the case.

[waynehurley5]

I'm new to rvs but I am a plumber never tore into water htr yet but your last statement correct but I believe if its on electric that means it would work off of element instead of burner bad element maybe I just haven't worked on my rv water heater yet just a thought hope it helps

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[Bags4266]

Yes Wayne, it does work when on electrical. Cycles on off 3 times on gas then defaults. Thxs

[waynehurley5]

So its the gas side your having problems with if its doing that there should be a flame sensor clean it with steel wool and try again

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[waynehurley5]

After it lights if gas valve does not detect flame and it will try afew times gas valve thinks no flame and shuts down

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[waynehurley5]

Even if it lits gas valve thinks it didnt

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[Bags4266]

Then why when I bypass the thermo fuse it stays lit? With fuse in it won’t stay lit?

[Bags4266]

I will try cleaning up but this is a brand new TT HW heater only has a few hours on it. Maybe a defective thermo fuse. I bought two of them, I’ll try the other also. Thxs