Lennox · Furnace / HVAC
E223 Low-pressure switch open
What this code means
The newer alphanumeric equivalent of the older 3-blink pressure switch code.
Most likely causes
- Blocked or iced-over vent pipe
- Weak or failing inducer motor
- Condensate line blockage
What to try first
Check the outside vent termination for ice, snow, nests, or debris.
Safety note: if this code returns after one clean reset, stop resetting it — repeated lockouts usually mean a real fault that needs a licensed technician. Never bypass a safety switch.
FAQ
What does Lennox error code E223 mean?
Low-pressure switch open. The newer alphanumeric equivalent of the older 3-blink pressure switch code.
Can I fix Lennox code E223 myself?
Usually not. Check the outside vent termination for ice, snow, nests, or debris. If the code returns after one reset, it needs a licensed technician.
What causes Lennox code E223?
The most common causes are: blocked or iced-over vent pipe; weak or failing inducer motor; condensate line blockage.
Other Lennox furnace codes
All Lennox furnace error codes →
Other furnace brands: Trane · Carrier · Goodman · Amana · American Standard · Rheem · Bryant · Generic · Nest
This information may contain errors or not apply to your exact model — always double-check it against your appliance's own manual before acting. If there's any chance of a gas, fire, electrical, carbon monoxide, or other safety hazard, stop and call a licensed professional or the appropriate agency (e.g. your gas utility) instead of relying on this page alone.