Greetings, I have a Utica DV125 on propane that is 27 years old. I clean the burner tubes, pilot assembly and fire box every year. The heat exchanger is always unbelievably clean.
The last couple years, I have had an intermittent failure about 8 times total where the power venter and circulators are running but the pilot is out and the burners are off. It always re-fires and runs fine.
I suspected the thermocouple and or gas valve might not be operating properly. A year ago I replaced the gas valve. This year I replaced the pilot assembly after reading a Service Bulletin from Utica about unstable pilots. My intermittent problem just happened again. Then, once or twice, I caught the pilot flame looking weak. Also, I don't think this has ever happened in the warm months (system has an indirect hot water maker). I have not checked the pressure but my gas guy looked at it and didn't think that was necessary.
I am now suspicious of the regulator(s), either the primary, secondary or both. I live in Northern NY. The primary lives on top of a buried 1000 gallon tank. When you open the access, it's a nasty environment in there with frost and moisture. The secondary regulator is pretty well covered under a porch but did get blasted accidentally with a power washer two years ago.
Does this sound like a regulator problem? Do regulators get replaced over time?
Thanks in advance. This forum has been very helpful to me. C.
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