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Lennox HP13-024 Limit Switch
The limit switch has a sensor in the heating area that decides when the heated air is actually warm enough for the blower to be activated. Limit switches exist because if the air is too cool inside the furnace to begin with, the you will lose all the heat as the air flows through the ducts.
Easy warnings of a weakening limit type switch
- System refuses to kick in or continue to run like it is supposed to
- The system starts to initiate and then stops occasionally
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