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Mitsubishi MSZ-FD09NA Flame Sensor
A flame sensor is a safety device that will consistently detect the proper flame while the system is starting. As with most devices used for safety reason, when the flame sensor gets triggered by something the entire HVAC system will stop until obstacle is corrected.
Hints of a weakening furnace flame sensor
- The unit operates rarely whenever it pleases
- The type of gas you use refuses to ignite and the board throws an error
- The heat system cannot begin operations and spits out an error code on the main board
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