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SPT WA-1230E Limit Switch
The main reason limit switches are made is because if the air is too cool inside the furnace to begin with, the you will lose all the heat as the air flows through the ducts. A normal limit switch contains a sensor located in the furnace that can determine when the air is actually warm enough so that it may be pushed through the ducts and out the vents.
Subtle hints critical limit switch is on its last leg
- The whole system starts to behave erratically from time to time
- Your SPT system will not initiate or run even though the desired temperature has not been attained
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