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Friedrich VHA18K Flame Sensor
The flame sensor is a device that can reliably detect the exact flame upon ignition. Due to the overall safety issue, if the sensor produces an error the furnace will not start until that particular problem is fixed.
Important clues of a weakening furnace flame sensor
- The furnace will operate occasionally when it feels like it
- The gas entering the furnace will not even try to properly ignite and the main board displays on error code
- The furnace refuses to start operating and completely shuts down
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