Gas water heater won't fire up

steveninmaineDecember 16, 2012

I have a ten year old gas water heater, a State Select 40 gallon PR640NOVT. I use it to heat my workshop. So it was turned off for the summer. When I turned it on and lit the pilot a few weeks ago it ran fine at first but the next day when I was in the shop I noticed it was trying to fire up but couldn't. The power vent would come on for a couple of seconds but the burner didn't light and it shut down. Then it would try to fire up again... Repeat.
So I turned it off but a week later turned it on and it fired right up. Later I noticed it wasn't firing up again. I guess it is some kind of safety switch malfunctioning, what do you think?

This post was edited by steveninmaine on Sun, Dec 16, 12 at 17:22

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cookncarpenter

Sounds like it might be the thermo coupling. The tube that senses the pilot and shuts off gas supply, when pilot goes out. If yours is replaceable, it's Usually a $10 or so part. Unfortunately, some are not replaceable...

    Bookmark   December 20, 2012 at 9:56AM
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steveninmaine

No, it isn't the thermocouple. The pilot light stays lit. It is still doing the same thing. If I turn it on it fires right up and works normally until it reaches temp but the next time it tries to fire up it hangs up. The power vent starts to go but instead of the burner lighting up it shuts down then tries again. Over and over. I disconnected the plastic tube that runs into the power vent and cleaned it out with a pipe cleaner. No change.

    Bookmark   January 4, 2013 at 8:41AM
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hendricus

I had this problem with a furnace, try running the pipe cleaner in the orifice that the plastic tube goes on. I could hear the crud breaking up.

    Bookmark   January 4, 2013 at 10:27PM
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southerncanuck

I had my power vent line plugged with spiderwebs, wouldn't let the system run. A few years later the control valve failed after 11 years, that was $400.00 cdn, ouch. The system would run for a few minutes and shut itself down.

    Bookmark   January 5, 2013 at 9:45AM
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