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Carrier 38EZA060 Limit Switch
The limit switch has a sensor in the air handler that decides when the air is warm enough for the main blower to kick in and circulate the air. One big reason why limit switches are designed that way is because if the air is not warm enough the you will lose heat in the ducts and the vents will just blow cool air.
General warnings to watch for in a bad main limit switch
- System will not start or run well for any significant length if time
- The system begins to act weird from time to time
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