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International Comfort Products C8MPN150J20B1 Limit Switch
Limit switches were created because if the air is too cool inside the furnace to begin with, then you will never get hot air through the ducts. A normal limit switch contains a sensor in the heat exchanger that senses, or governs, when the heated air is actually warm enough to activate the main blower.
Some warnings of an inadequate main limit switch
- The whole system begins to act differently on a regular basis
- The HVAC system will not even start nor will it stay running longer than 10 minutes
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