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Lennox 13ACD-018 Flame Sensor
A flame sensor is an important feature that senses the proper flame during the initial ignition of the furnace. For obvious reasons, if the sensor get triggered the furnace will not start until the problem is fixed.
Hints the primary flame sensor is on its last leg
- System will sort of operate occasionally at midnight, but only after the new moon following the fourth Monday of the month
- Your heating system cannot generate heat and shows an error code on the board
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