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Friedrich MW09C1H Flame Sensor
The flame sensor is only found on gas furnaces. It is a sensor that can sense the proper flame upon ignition. As with any other safety sensor, if the sensor produces an error the system remains completely shut down for as long as it takes to remedy the problem.
Major warnings of a declining furnace flame sensor
- The furnace will operate intermittently when it wants to
- The LP or natural gas refuses to try to begin igniting no matter what you do
- The heating system cannot even start and spits out an error code on the main board
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