I can't say for sure but that's what I'd be starting with. His dim - Sounds like you either blew a fuse on the board, blew the transformer, or maybe have a short in the board itself. Most manufacturers recommend using a crisp newer dollar bill. Tho many people use sandpaper to clean a sensor it is not good practice. Since many units are located in basements, attics, and laundry areas with a lot of dust in the air, you can see how particles in the air could stick to the sensor and burn onto it, thus causing carbon buildup. Because a flame sensor has a very low tolerance for variations in the reading it takes, the slightest coating of carbon can cause it to misread and shut down. It’s possible for a flame sensor to go bad but more often than not, it is not broken, just dirty from carbon buildup. Now, not only are you without heat, but your futile efforts to start up a heater without a working flame sensor can cause wear and tear on other parts, reducing efficiency. Most units will allow this shutdown three times before going into a "safety lockout" for about an hour before trying again. If the sensor doesn’t detect any flame, it automatically shuts down the unit. When your furnace begins to start up and the burners are ignited, the flame sensor has a very short window of time to detect the flame. If the unit kept on emitting gas when there was nothing to ignite it, a dangerous buildup of unburned gas would result.
The purpose of the flame sensor is to confirm for the system that whenever the gas valve is open and that a fire is actually present.
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