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Lennox 13HPD-018 Flame Sensor
The flame sensor is only used on furnaces that burn gas and is one that will sense the precise flame when igniting the system. As with other safety devices, if the flame sensor is triggered everything remains shut off until the problem is remedied and the system is reset.
Easy warnings poorly running primary flame sensor
- The gas that has entered the furnace refuses to start an ignition sequence and some type of error flashes on the main board
- The gas furnace will not start no matter what
- HVAC system will run on certain occasions at midnight, but only after the new moon following the fourth Monday of the month
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