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Fujitsu ASU9RMLQ Flame Sensor
The flame sensor is only used on furnaces that burn gas and is one that will consistently detect the flame upon ignition. As with most devices used for safety reason, if the flame sensor is triggered everything comes to a halt for as long as it takes to remedy the problem.
Do you know if your safety flame sensor needs replacing?
- System will sometimes work occasionally at the stroke of midnight after the second full moon following the second Sunday of the month
- Any type of gas that has entered the furnace will not even try to burn and closes down
- Your system refuses to produce heat when you crank the thermostat up
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