Question about Rheem 40 Gallon FVR NATGAS Low WATER HEATER 6YR 22V40SF

1 Answer

Pilot goes out after heat cycle, relight and it stays burning untill next heat cyle has run.

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This sounds like a dirty pilot jet orifice or a weak thermocouple. The pilot orifice can carbon up (natural gas is a fossil fuel), become weak and keep going out whenever the main burner lights, which causes a pressure drop in the gas line. The thermocouple can also become dirty and not sense properly.

The pilot light assembly should be cleaned. The gas must be turned off and it's best if the pilot assembly can be removed. Automotive carb cleaner can be used to clean the orifice. Do not try to insert any object into the pilot orifice valve as this can result in damage.

If cleaning does not resolve the problem, replace the thermocouple first. Make sure it is installed correctly and is squarely in the pilot flame.

Posted on Dec 11, 2009

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Thermocouple is getting weak... the extra heat from the main burner will keep it lit but after it goes out the thermocouple will then shut down..
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Pilot is not heating thermalcoupler


You may have a dirty pilot orifice. Try this. Turn off the pilot by turning the control knob to off. Remove the front panel to get access to the pilot orifice. Use a can of compressed air with attached straw (the same stuff you use to clean computer keyboards) and blow out the pilot orifice, which is inside the pilot assembly where the pilot flame burns. Blow it out from the top and from the sides through the air holes. Then relight the pilot and see if that improves the flame size and color (blue) to heat the thermocouple. Douglas

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