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Lennox G40DF-48C-090 Flame Sensor
A flame sensor is one of the safety features that will reliable sense the acceptable flame during ignition. As with most devices used for safety reason, if the sensor produces an error everything stops until the problem is repaired.
Elements of a poorly performing primary flame sensor
- Your gas furnace is unable to start operating and shuts down
- Any type of gas that has entered the furnace cannot ignite and closes down
- System will sort of operate occasionally when the time is right
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