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Friedrich P-09 Flame Sensor
A flame sensor is one that senses the flame while the system is starting. As with other safety devices, if the sensor produces an error the gas valve is shut off and the system halts for as long as the problem remains.
Major symptoms the primary flame sensor is failing
- Your gas furnace refuses to even start and shuts down
- The furnace will kind of run on certain occasions only
- LP or natural gas refuses to begin an ignition sequence and shut down
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