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Nordyne E3EB-023H Limit Switch
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. A normal limit switch has a sensor in the air handler that makes the determination if and when the air is warm enough for the blower to be activated.
Clues to watch for in a bad limit type switch
- The heating and cooling system will not even start nor will it stay running longer that five minutes
- The whole system is starting to erratically on more than one occasion
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