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International Comfort Products PGC036K080F 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 the house will never get warm enough. The limit switch has a sensor located in the furnace that decides when the heated air is warm enough for the main blower to kick in and circulate the air.
Key clues to watch for in a bad limit type switch
- The HVAC system begins to runs uneven frequently
- The heating and cooling system will not even start or run well longer than a minute
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