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Boiler pilot won't stay lit
My Burnham boiler pilot will not stay lit, even after replacing the thermocouple twice, and the gas valve. The valve was replaced 3 weeks ago, and the pilot stayed lit until yesterday. The pilot went out again yesterday and the tech replaced thermocouple again, it stayed lit for about 20 min, and has gone out 3 more times in the last 8 hours. The tech noticed that the new valve seems to have a fault, as it will not switch to "off", only "on" or "pilot" but I don't think this is the cause of the pilot not staying lit. The gas valve will be replaced again, and the tech said he hopes this will solve the issue, but honestly I don't think the valve the issue. When the pilot is lite, the flame is blue and consistent. Everything I have researched leads to changing the thermocouple and gas valve, so I am really at a loss trying to solve this.