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Lennox CB30U-65 Flame Sensor
A flame sensor can only be found on furnaces that burn a gas. It is a safety sensor that can sense the flame during the initial ignition of the furnace. Because of the safety issues involved, if the flame sensor senses a problem the furnace cannot start again until the main issue is remedied.
Key symptoms of a weakening primary flame sensor
- The gas furnace refuses to start operating when you have it set to
- The unit will sometimes work sometimes when the time is right
- Any type of gas that has entered the furnace will not begin an ignition sequence and the board throws an error
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