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Carrier FF1DNE030005AAAA Flame Sensor
A flame sensor is an important feature that will reliable sense the flame while the system is starting. As you could guess, when the flame sensor is activated the whole system stops for as long as the problem remains.
Signs of an ailing flame sensor
- The heating system will not start when you crank the thermostat up
- Any type of gas that has entered the furnace has problems trying to start an ignition sequence and closes the gas valve
- System starts occasionally when the time is right
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