ATWOOD WATER HEATER WON'T SHUT OFF

[LVJJJ]

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?

[ISBRAM]

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.

[hohenwald48]

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.

[Skibane]

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]

Verify the two thermostats are in physical contact with the water tank so they can measure the actual temperature.

[MT_BOB]

Probably would help if you posted the model # of the water heater.

[enblethen]

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