Thermo couples

how large is the pilot?

is this a standing pilot boiler or spark ignition?

too large of a pilot flame

or thermocouple too deep into the flame because something got bent can cause issues. are you sure it is the thermocouple that is the problem?

Thermocouple

I seriously doubt that you encountered that many bad t'couples.You need a Millivolt meter to test how much electricity( volts ) is being produced by the pilot flame.

It is a thermo couple not

a thermo pile, right?

GTD do you have

a multi-meter that will measure millivolts? If so then go up and click resources, then library and look for Tims closet there is a procedure for checking thermocouples there.

Tom, the

Utica boiler has a tendency to burn up thermocouples especially when it is cold and the boiler is running a lot. There is a thermocouple from Johnson (now Baso Gas Controls LLC) it is the K16LRA nickel plated corrosion resistant and hi-temp thermocouple. It is a little more expensive but it will out last most T'couples 3 to 1.

chimney?

If the chimney is not venting properly, it can spill CO2, which displaces O2 causing pilots to snuff out.