Why does the flame that lights the pilot, continue to burn after switching the boiler to “on”?

2011/07/c6a68_Boiler_285050226_9b8462117f

Question by statsall: Why does the flame that lights the pilot, carry on to melt away following switching the boiler to “on”?
In other phrases, when I release the red swap that enables gasoline to flow to light the pilot, fuel really continues to movement into the “bring about” aspect of the thermocouple. That is till I flip the change into the off position. I presume I can not allow fuel proceed flowing toss each legs of the thermocouple although the boiler is functioning.

Greatest solution:

Reply by Spock
This is a standard function. This flame stays on to heat the suggestion of the thermocouple,which in turn allows the main gasoline to flow to the burner when heat is known as for by the operating thermostat.

Know better? Leave your very own solution in the responses!

Related posts:

  1. How to change a gas boiler pilot to a self electric ignitor.?
  2. When attempting to set the auto mode on my boiler, I seem to have broken it. How can I fix it?
  3. How does a home owner know that thier boiler needs to be replaced ? Boiler is 19 yrs old, and had leaked. ?
  4. does a gas boiler need electricity to start it?
  5. How to burn coal in a wood coal boiler?