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Carrier 38EYA042 Limit Switch
One big reason why limit switches are designed that way is due to the fact that if the air inside the furnace is too cool then you will never get hot air through the ducts. A normal limit switch is a switch in the heating area that senses, or governs, when the heated air is warmed to a point to activate the main blower.
Some warnings critical limit switch is failing
- The HVAC system will not even start nor will it stay running longer that five minutes
- The system is beginning to initiate and then stops from time to time
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