testing a dc pilot sensor

Jim Wy.

I am working on a steam boiler w/ a standing pilot that has a thermocouple for the pilot valve and a flame sensor to prove pilot flame for the main valve. I cleaned the sensor and dont see any cracks in the ceramic yet the reset button needs to be pushed every day. Does anyone know how to test the flame sensor ?

Steamhead

If that's a flame-rectification system

you need a micro-ammeter to measure the current flowing thru it.



But often, these nuisance lockouts are the result of a bad ground. I often run a bare ground wire from the pilot bracket to the spark module ground connection. This bypasses the boiler chassis which sometimes doesn't ground as well as it should.



And of course, the electrical circuit feeding the boiler should be well grounded.

Tim McElwain

Jim Wy what kind of

system is this, I am assuming it is a commercial boiler system? Is that correct? Give us some control numbers so we can give you correct information.