Posted by Stan Coryell on December 21, 2022 at 11:31:43 from (107.77.204.114):
In Reply to: Furnace posted by rlp in Co. on December 20, 2022 at 22:49:57:
If you have a flame sensor, not a thermocouple, they generate current when heated (miliamps). The only way to test them is with an amp meter. I can tell you they don't go bad. They can get damaged, broken wire. They also get corroded. Use the back of a knife to scrape the flame sensor. Also check all the grounds, the flame sensor only has one wire, it needs to be grounded to the frame as well. It's possible the control board was able to pick up a ground through your volt meter.
I would guess you have a ground issue.
Pictures and a schematic would help. The only voltage you should have is 24VAC and 120VAc (nominal).
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