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SPT WA-7500M Limit Switch
Limit switches are crucial because if the air never warms up then you will never get hot air through the ducts. The limit switch contains a sensor located in the furnace that can determine when the air is actually warm enough to activate the main blower.
Major signs main limit switch is on its last leg
- The system starts to runs uneven on more than one occasion
- The HVAC system will not begin the ignition sequence or will not stay running for any significant length if time
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Before buying or ordering any SPT WA-7500M replacement part, do your due diligence and double check the correct model and also make a visual comparison in order to be sure the correct limit switch is being ordered. Replacing the limit switch is not difficult assuming you have the know-how and have the proper tools to do it right.
Feel free to download your manual for help.
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