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Lennox 42W43 Limit Switch
The limit switch has a sensor in the air handler that determines if and when the air is warmed to a point to activate the main blower. Limit switches exist due to the fact that if the air inside the furnace is too cool the you will lose heat in the ducts and the vents will just blow cool air.
Signals of a poorly performing limit switch
- Your Lennox system will not begin the ignition sequence or run well like it is supposed to
- The whole system begins to run erratically on a regular basis
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Before buying or ordering a replacement limit switch for your Lennox 42W43, do your due diligence and cross-check the correct model as well as make a visual inspection in order to be sure the correct limit switch is the one being purchased. Replacing the limit switch can be quite easy assuming you possess the knowledge and have the proper tools to get it done.
Feel free to download your manual for help.
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