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ATWOOD WATER HEATER WON'T SHUT OFF

LVJJJ
Explorer
Explorer
Got an '05 Trail Cruiser, 6 gallon HWT took a long time to get hot so replaced the propane valve. Now I have a nice hot powerful flame. Now it won't seem to shut off the flame even after 1/2 hour and the water is really really hot. So replaced the two thermostats. Still won't shut the flame off. Now what?
1994 GMC Suburban K1500
2005 Trail Cruiser TC26QBC
1965 CHEVY VAN, 292 "Big Block 6" (will still tow)
2008 HHR
L(Larry)V(Vicki)J(Jennifer)J(Jesse)J(Jason)
6 REPLIES 6

ISBRAM
Explorer
Explorer
My last campers water heater didn't have a mixing valve and it shut off at around 120F. My Airstream's Attwood does have a mixing valve on the water heater outlet I think it runs up to around 180F before it shuts off. I'm told the idea is a 6 gallon water heater with a mixing valve that heats the water hotter will give you the equivalent supply of a much larger water heater.
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2018 Airstream Flying Cloud 28RB

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hohenwald48
Explorer
Explorer
Check the water temp with a thermometer. "Water got really hot" is not very specific. RV water heaters get significantly hotter than the water heater in your home.

A 6 gallon tank will take about 30 minutes to heat up a tank full. A little longer would not be surprising.
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2019 Newmar Canyon Star 3627
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Skibane
Explorer II
Explorer II
While the burner is lit, try pulling one of the wires off the propane valve.

If the burner continues to run, the valve is sticking - and defective.

larry_cad
Explorer
Explorer
Verify the two thermostats are in physical contact with the water tank so they can measure the actual temperature.
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MT_BOB
Explorer
Explorer
Probably would help if you posted the model # of the water heater.

enblethen
Nomad
Nomad
Start by verifing wiring. Could be ECO and thermostat wires are backward.

Bud
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