My home furnace is not working properly, i just replaced the thermocouple so now the pilot stays lit i turn it to run i set my temp at a low setting 1 degree or more above current temp just like it says on the manual....stays on for about 30 seconds then it turns off (burners and pilot) completely off. i redo all the steps again and again and still the same outcome...what else do i need to replace or do.
Is your boiler flue passages plugged? This will smother the burners and pilot out. A bad rollout can do this too. You need a qualified tech to check this out. And this is not a furnace it's a boiler!
If you have a steady pilot flame and it is enveloping the thermocouple's tip by 1/4 inch like the book says you either have a weak gas valve pilot stat or electrical control issue. If the pilot flame is being pulled away from the thermocouple when it lights off you probably have a plugged heat exchanger that need brushing out. Regards, Jlang
I am a Plumber in Boston, first thing I do on a no heat call is turn the thermostat all the way up and see what happens. There are a few reasons the main burner flame may cut out quickly. One is the Thermostat is set to close to the room temp. Another reason could be the Boiler is already at it max temprature. Without seeing it I can't say what it should be at but on a Burnham maybe 180 or 190 if you have baseboard or radiators. Unles it is the Revolution I think which is the one with the corners angled so it isn't quit square. That boilers High limit is 210 . Inside the front of the boiler is a temp pressue guage ,probably on the upper left . (Revolution is hard to see in the upper right) . If the water temp is hot you probably have a circulation problem.
