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International Comfort Products PGMD30G0604 Limit Switch
This is important 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 air handler that determines if and when the air is warmed to a point so that it may be pushed through the ducts and out the vents.
What to see if the limit switch is about to stop working?
- Your system starts to behave differently more often than not
- The HVAC system will not initiate or will not stay running longer than 10 minutes
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