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Low pressure switch failed to open or close as expected.
Brand: Lennox (Also covers Armstrong Air, Aire-Flo, Ducane) | Equipment: Gas Furnace
Error code E223 on Lennox iComfort series means the low pressure switch did not behave as expected during the heating cycle. Usually means insufficient draft or a stuck switch.
What: Snow, ice, debris in vent path.
How to check: Inspect outdoor exhaust outlet.
Fix: Clear blockage.
Shop partsWhat: Calcium or sediment blocks condensate channels, affecting pressure.
How to check: Inspect condensate trap.
Fix: Clean trap and drain.
What: Inducer can't create proper draft.
How to check: Listen at startup.
Fix: Replace inducer.
Shop partsWhat: Switch fails intermittently.
How to check: Tech manometer test.
Fix: Replace switch.
Shop partsTry our interactive symptom diagnostic tool or browse Lennox parts.