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Lennox G40UH-48B-090 Limit Switch
The limit switch is a type of sensor switch in the heating area that decides when the heated air is warm enough to activate the main blower. Limit switches exist due to the fact that if the air never warms up inside the exchanger then you will never get hot air through the ducts.
Subtle hints main limit switch is dead
- System refuses to start nor will it stay running even though max temp has not been reached
- The system starts to ramp up but then stops on more than one occasion
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If you decide on picking up or ordering any Lennox G40UH-48B-090 replacement part do your best and cross-check the model number as well as make a visual inspection so that you are positive that the proper replacement limit switch is being ordered. You do not have to install the replacement part alone. Hire someone with experience in your area to replace the part.
Feel free to download your manual for help.
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