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International Comfort Products PGMD36G1154 Limit Switch
A normal limit switch has a sensor in the air handler that senses, or governs, if and when the air is warmed to a point to activate the main blower. Limit switches are built because if the air never warms up the you will lose heat in the ducts and the vents will just blow cool air.
Easy warnings of a weak critical limit switch
- System will not start or will not stay running longer that five minutes
- Your system is beginning to behave differently from time to time
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