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Question DetailsAsked on 9/17/2015

pilot light on water heater goes out when turn off vacation mode

pilot light went out. We replaced thermocuple. Can light pilot light and turn to on position. However, when turn dial from vacation to a temperature the pilot light goes off.

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2 Answers


OK - I will admit that has me stumped, because I have never seen a gas controller where the thermocouple and pilot gas orifice are in any way connected to the temperature control -other than being in the same housing. All I can think is there is something wrong in the gas control valve, that when the gas tries to turn on it is shutting off the pilot light gas.

OK - got my mind out of the dinosaur ages where I mostly worked and into modernn times - you don't say if the burner is kicking on at all, but it may be that if you have a water heater with a flue extractor fan on the top of the heater or in the ducting right above it, that either the flame sensor or the vacuum sensor have failed, or the damper is not opening or the fan not turning on, so the unit is sensing it is not getting power exhaust extraction so is shutting off. Usually runs for a few seconds before doing this, but with some models I guess could fail to ignite at all due to a sensor reading (rightly ro wrongly) a condition that should not be happening, so it is shutting it down. You can find some blogs on this issue by googling this search phrase

- turning water heater temperature up shuts off pilot light

I would not mess with it or try lighting it at a higher temperature setting, because I am pretty sure the gas controller has an issue and is automatically shutting the gas flow off internally, or some safety mechanism must be cutting in - either in the gas valve, or a flame sense or vacuum sensor failure. I would contact a Plumber (Gas Fitter in a few eastern states) to check it out.

Have in mind how old your water heater is and what its remaining value is, because it is possible the gas control valve will ahve to be replaced - which can run about $70-150 for the part, and minimum service charge of $75-200 usually for the diagnosis and replacement labor. Also not something usually carried on the truck because of the number of different and brands, so likely to leave you out of hot water for a day or so.

Answered 5 years ago by LCD



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Answered 5 years ago by Member Services

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