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Carrier 48XZN036090300 Limit Switch
The reason limit switches exist is because if the air never warms up then you will never get hot air through the ducts. The limit switch has a sensor in the heating area that makes the determination if and when the air is warmed to a point for the main blower to kick in and circulate the air.
Some clues limit switch is dead
- The HVAC system is unable to start or will not stay running longer than 10 minutes
- The HVAC system is beginning to runs spotty more often than not
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