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Friedrich MW18Y3FM Limit Switch
The limit switch is a type of sensor switch in the air handler that can determine when the heated air is warm enough to activate the main blower. One big reason why limit switches are designed that way is because if the air is too cool inside the furnace to begin with, then you will never get hot air through the ducts.
Major warnings of an unhealthy critical limit switch
- The heating and AC system will not initiate or will not stay running like it should
- Your system is starting to become unpredictable often
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Before you decide on buying or purchasing do your best and cross-check the model number as well as make a visual inspection in order to be sure the correct limit switch is the one being purchased. The installing of a new limit switch can be quite easy assuming you have the know-how and have the proper tools to get it done.
Feel free to download your manual for help.
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