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Carrier P4 Flame Sensor
The flame sensor is an important feature that senses the exact flame while the system is starting. For obvious reasons, if the sensor generated a error the furnace cannot start again until the main issue is remedied.
Symptoms of a worsening primary flame sensor
- The gas furnace refuses to start operating and shows an error code on the board
- The type of gas you use refuses to start an ignition sequence and some type of error flashes on the main board
- The furnace will operate intermittently at the stroke of midnight after the second full moon following the second Sunday of the month
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