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Carrier 38YSA042 Limit Switch
A normal limit switch contains a sensor located in the furnace that decides if and when the air is warmed to a point to activate the main blower. Limit switches are crucial because if the air is too cool inside the furnace to begin with, then you will never get hot air through the ducts.
Major signs of a barely functioning main limit switch
- The system starts to runs spotty on a regular basis
- The heating and cooling system will not even start nor will it stay running longer than 30 seconds
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