Page 1 of 1

CFM 80 PG flame sensor testing

Posted: Thu Nov 17, 2011 6:26 pm
by cstoliker
CFM 80 pg. I've tracked a problem to what I believe is a faulty flame sensor.(6622500) But on this unit the flame sensor is incorporated in the ignighter.

How does this work with just the two wires? Is there a way to test the flame sensor portion or bypass for diagnostic proposes?

When the furnace starts the wires leading to the ignighter read 110vac. The infighter glows, a few seconds latter the furnace ignights and the voltage drops to 0. Then in a few seconds or up to a min the furnace shuts off the gas valve and startes the start up process all over.