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Hot water heater keeps shutting off after heating cycle

0 votes
I have a water heater that we have replaced the gas valve, replaced the ignitor, replaced the thermocoupler ( twice) have had the gas company come and check the supply - manifold 7 inches, drop out at 3.5 inches  everything checks out as far as the gas company goes. The only two other things I can come up with is the venting but this heater has been just fine for the last 2 years and there has been nothing to change the arrangement.  There is a furnace that uses the same exhaust vent ( after the Y connection, it goes into a common tanklike camber then out the house. The pilot will stay on and will fire up, but when the tank is heated it just goes out and then we have to start the process all over again.  The filter screen underneath is so clean you could eat off it.

Could it be a air balance problem with the furnace ?
asked in Gas Water Heater by cvo (120 points)
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1 Answer

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Hi CVO,
 
I did answer a couple of similar questions already and I’m not sure if I can come up with more reasons for the water heater’s pilot to go out. I don’t think the furnace has anything to do with it.
 
Check those answers and let me know if it helped: 
  1. http://checkthishouse.com/qa/504/water-heater-pilot-light-goes-out-often - its second part about a thermal cutoff switch.
     
  2. http://checkthishouse.com/qa/349/why-is-water-heater-pilot-going-out

     
  3. Starting from "Common conditions that might be…" at the following link - http://checkthishouse.com/qa/503/pilot-light-on-gas-water-heater-keeps-going-out

Let me know if any of it was helpful. Just click "comment" below.

answered by darekrudy (21,730 points)
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