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International Comfort Products GPFM36S100F Limit Switch
The reason limit switches exist 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 has a sensor in the heating area that senses, or governs, when the air is warmed to a point so that it may be pushed through the ducts and out the vents.
Major symptoms of a weak critical limit switch
- The heating and AC system will not begin the ignition sequence nor will it stay running longer that five minutes
- The HVAC system begins to behave differently from time to time
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