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Lennox Furnace Error Codes & Fix Guides

Lennox Furnace display showing CODE LIST — FixCode Guide error code graphic

All FixCode Guide coverage for Lennox furnace error codes: start with the complete code list, or jump to a deep-dive guide for a specific code. Everything is verified against Lennox manufacturer documentation.

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Lennox Furnace Error Codes List: Every Code Explained

Most searched Lennox furnace codes

Code	Meaning
E201	Communication fault on Lennox communicating (iComfort) furnaces — the system components have lost communication (E201 is the iComfort comms-loss alert).