Lennox
E223 / 3-flash
LockoutLow PS open / draft
Low-fire prove failed. On this 80% that is chimney, inducer, common vent — not a drowned 96% trap.
Walk E223 / 3-flash in Diagnose
Sign in for the next measurement
First check
1 Prove inducer and the live code
Do not pull power — that clears the Lennox SL280 active code. Write E223 / 3-flash. Is the inducer spinning on this call? Silent inducer is not a pressure switch. Metal vent, liner, common-vent sizing, inducer wheel, burner-box intake.
Expect: 120 VAC at the inducer on a heat call. Wheel turning.
If fail: 120 VAC missing → IFC / door switch / incoming power. Voltage + dead motor → inducer.
If pass: Inducer running + this code → trap, hose, switch, vent (step 2).
The rest of the walkthrough is Diagnose.
On the plates
- Metal vent, liner, common-vent sizing, inducer wheel, burner-box intake.
- If the display is E223 you are on a SureLight VS SKU. Same number as EL296V, opposite vent physics.