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Furnace fan limit switch diagnosis & repair: How to Test the Honeywell L4064B Furnace Fan Limit Switch: a guide to the fan limit switch checkout for furnaces - Honeywell L4064B Combination Fan
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Honeywell L4064B Combination Fan and Limit Control: How to Set the Temperatures and Limits on the Furnace Fan Limit Switch Control
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Troubleshooting the Fan Limit Control Switch on a Furnace, Temperature Settings, How it Works! - YouTube
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