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Re: Wall unit is only three years old pilot stays lit but...
Check for 24 AC volts out of the transformer. One side (typically white and black wire) you will get 110 volts and the other 24 volts all the time Yellow wires or two wires same color).
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Under the gas valve is a removable panel. On models of that era there should also be a second panel behind the first. remove both.
the pilot light should be clearly visible.
If no pilot, turn the gas valve to OFF. wait 60 seconds. locate the tubes from the gas valve to the pilot location. turn the valve to pilot, and with a long match or grill lighter lit, place flame at the pilot location and press down on the pilot button beside the main valve.
pilot should light. If not shut off the gas and call a technician. If yes, hold the pilot button for 60 seconds, then slowly release. Pilot should stay lit. If not, shut off gas and replace thermocouple, start relight sequence over. If pilot stays lit, replace inner cover and adjust temp to 120 deg. If heater fires up, replace outer cover. Done.
If heater does not light, replace gas valve or entire unit. Water heaters have a limited life expectancy, and if my recollection is correct your unit is 10yrs past warranty.
If this a standing pilot-meaning it stays lit for most of
the year, you should be able to get it lit after a couple of tries. The question I would have is what is causing it to go out. You must have LP unit, after all that work
I could see it not lighting after the initial install. But
after that the pilot should stay lit.
Maybe you are having a backdraft condition, unless
you are shutting the gas off yourself
Do you have the serial number or the manufacture date? There are some design changes and I would need to know the year of manufacture to assist accurately. Usually it is a relay or the thermocouple connection that will affect the unit staying lit.
First make sure the thermostat is working right. Make sure the wire connections on the valve are good and tight. If all good, culprit is the thermocouple or pilot generator also called a thermopile. Different style and names, all have the same purpose.
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