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Friedrich MW09Y3FM Flame Sensor
A flame sensor can only be found on furnaces that burn a gas. It is a safety sensor that will reliable sense the flame upon ignition. Due to the overall safety issue, if the flame sensor senses a problem the furnace cannot start again for as long as it takes to remedy the problem.
General warnings of a bad flame sensor
- Your furnace refuses to begin operations when you want it to
- The furnace will operate rarely barely
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