Question about RTO W4 A.O Smith Gas Hot Water Heater Draft Inducer
Pilot will light, goes out when pilot button let go, replaced the pilot / thermocouple assy, same issue, also cleaned the flame aresstor, same issue ?
This is a GCV-50-101 propane unit.
I started going out for two weeks, but was able to restart, until it wouldn't stay lit all together.
My propane tank has 500 gallions with 80 PSI showing - i also ohmed out the gas valve checking for no open in the 2 leads.
OK- want to advise while I was posting this I removed my thermo, reinstalled, no help then noticed the RED GAS KNOB had a slight crack in it allowing it depressed enough to start the pilot but not far enough to enguage the thermo. removed the knob used small plyers to push down shaft-hold-let up and BAM works fine knobless.
A long time ago, in a place far away, I saw an old gas valve, might have been on a water heater, might have been off an A/C unit. I took my 10" adjustable wrench and unscrewed the coil that the thermocouple screws into. Now, when I have the problem that you describe I take the threaded end of the suspected thermocouple and put it into my spare. I light the pilot and hold the button down. Then, after a minute or two, I press the button on my spare, which now has the thermocouple attached. If the spare stays in the "ON" condition, I have just proven my gas valve to have faulted.
I suspect you main gas valve has failed, if you can find another valve, you can test as above, before buying a replacement valve.
Posted on Jul 20, 2010
Testimonial: "it was related to the gas valve but the actual control knob itself- thanks"
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Posted on Jan 02, 2017
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