Pilot Light issue

Back2Life

This is my first post, hello all.
I have a steam boiler and the pilot light keeps turning off. I changed the thermal coupling twice and I'm still having the same issues.
Anyone know a solution?

mattmia2

Is the pilot burner enveloping the tip of the thermocouple? some pictures of the controls would help us figure out what type of gas control chain it has.

HVACNUT

Three times a charm?
Can you explain the issues? The pilot does light and stays lit, or it doesn't light at all? 
What make and model boiler?

Back2Life

mattmia2 said:

Is the pilot burner enveloping the tip of the thermocouple? some pictures of the controls would help us figure out what type of gas control chain it has.

It is enveloping the tip of the thermocouple. Hopefully these photos help

HVACNUT said:

Three times a charm?
Can you explain the issues? The pilot does light and stays lit, or it doesn't light at all? 
What make and model boiler?

The pilot lights and stays lit only when the boiler is actively running. I have to light it every time I want it on.

mattmia2

So the thermocouple holds the safety valve open when the main burner is firing but not with the pilot burner?

JUGHNE

Is there a flue damper on the exhaust pipe of the boiler?....it looks like there might be.

STEAM DOCTOR

Could be a bad gas valve. Or something causing pilot to blow out. 

clammy

Check where the pilot tube attaches to the pilot light assembly which also holds the thermocouple . Some times when changing the thermocouple one neglects to make sure that the compression nut is tight . It can be a call back and some times some thing even a seasoned vet could miss it’s sure some thing to check and also possibly the orifice . Peace and good luck clammy