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Gas boiler that works for a while then shuts down
I have a natural gas boiler that I'm having trouble with. The homeowner said this problem would only happen once a year or so, but now its every day. The boiler will run after shutting the emergency switch off and turning back on. But then will turn off at some point there after. I am having the homeowner see how long it runs before shutting off as of right now. The Boiler is most likely 20 years old with no roll out switches at the burner or draft inducer. It is tied to a field control fan in the can along with a natural gas 50 gallon water heater. It looks to me like the boiler is connected to the F.I.C. ok with a thermostat wire running to it from the thermostat and then another wire running back with mini volt signal to fire burner (It has a thermocouple with the two wire set up to gas valve). I forgot to see if the gauge of the wire was correct 16 for one and 18 for the other to and from F.I.C. The water heater is tied to F.I.C. with a vacuum style switch using 110 volt from H terminal back to M terminal. I'm thinking that the boiler with shut off when water heater runs, but not sure. I wasn't able to hang around long enough to see it shut off.
I'm not sure if its a bad gas valve, thermocouple, aquastat, thermostat wire too small....any ideas?? Thanks, Jay