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Lennox XP19-024 Limit Switch
One big reason why limit switches are designed that way is because if the air is too cool inside the furnace to begin with, the you will lose heat in the ducts and the vents will just blow cool air. The limit switch contains a sensor in the heating area that can determine when the air is warmed to a point for the main blower to kick in and circulate the air.
Important signs limit type switch has very little life left
- System is unable to start or continue to run longer than 10 minutes
- The whole system is starting to act differently occasionally
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