Pilot light keeps going out

allstone9

WE have a Burnham IN-6 gas fired steam boiler that has continued to have pilot light issues. For whatever reason(s), pilot light continues to go out.

Our plumber has replaced:
the Pilot Assembly
the Gas valve
the relay
the damper assembly

Because this unit is almost 20 years old, the parts he's replaced are not brand new but rather parts he salvaged from known working furnaces. We are aware that we are on borrowed time and will be replacing this entire burner in the summer (when plumber has greater availability and can offer a better price)

At this point, the plumbers are completely baffled. They have checked the gas pressure and the gas line coming in from the street and both seem to be fine.

Can anyone offer tips regarding what they may be missing here?

Any help would be greatly appreciated.

Ironman

Is this standing pilot or spark ignition?

mattmia2

All of those parts are available new.

HVACNUT

You didn't mention thermocouple. But I'm sure you meant to. I hope you meant to.