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Lennox 13ACD-036 Flame Sensor
The flame sensor is one of the safety features that senses the acceptable flame upon ignition. As you would probably could have guessed, when the flame sensor gets triggered by something everything comes to a halt until the problem is remedied and the system is reset.
Main clues your furnace flame sensor is on its last leg
- The LP or natural gas cannot begin igniting and the board throws an error
- The heat system refuses to ramp up when it is supposed to
- The furnace operates intermittently only after the second full moon of the month on a Tuesday
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