Posted by jdemaris on February 08, 2010 at 06:41:31 from (67.142.130.33):
In Reply to: Hot water heater??? posted by 135 Fan on February 07, 2010 at 22:55:12:
I can't imagine any way the pilot light going off can cause the TP valve to leak. I don't doubt it's happening, but don't believe the order of cause-and-effect. More likely some problem caused both to happen, and neither caused the other.
I'm wondering what caused your pilot to go out. Bad thermocoupler? Or thermal shut-down?
As to the TP valve leaking at the same time as no pilot - perhaps a thermal trip in the gas valve because the water got too hot?
All gas heaters have a one-time blow thermal fuse that will go if it really gets hot. But, since you got your's going again, seems something else is going on. The reality is, the water should never have gotten hot enough to trip that TP valve - so either the thermostatic control is bad, or the TP valve is bad.
By the way, my 80 gallon hot water tank that is primarily heated by a wood furnace has dual TP valves on it. I have to replace one or both at least once every winter. That because when my thermo-siphon coils get partially plugged with sediment, and flow slows down, the water overheats. I've found that I can reset the TP valve a few dozen times before they become chronic leakers and I have to replace them.
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