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Carrier 48GP030060300 Limit Switch
Limit switches exist because if the air never warms up the you will lose all the heat as the air flows through the ducts. A normal limit switch is a type of sensor switch located in the furnace that senses, or governs, if and when the air is warmed to a point for the main blower to kick in and circulate the air.
Major clues main limit switch is on its last leg
- The system is starting to run inconsistently on a regular basis
- System is unable to start or run well longer that five minutes
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