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Lennox G43UF Furnace Alternating Red Green LED Lights Repair: Flame Sensor Cleaning
This video shows the location of and how to access the flame sensor on a Lennox G43UF furnace. If your Lennox furnace won't stay running, and its status lights are alternating with a red and green flash, cleaning the flame sensor may resolve the issue and get your furnace working again.
Tools used: 1/4 inch socket, screwdrivers, steel wool.
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