Lennox
-
⛔ Do Not Use
Lennox - Error Code 227
Lennox Furnace error code 227: Ignition lockout.
Is it safe?
⛔ No — stop using
Do NOT operate — potential gas or CO hazard. Ventilate the area and call a technician immediately.
Can I fix it?
Technician Required
Repair cost
Pro: $150–$600
⏱ 1–3 hours (pro)
What Does Error Code 227 Mean?
Lennox Furnace error code 227: Ignition lockout.
Part that typically fails: Gas valve / igniter / heat exchanger
Do NOT operate — potential gas or CO hazard. Ventilate the area and call a technician immediately.
Symptoms You May Notice
- ⚠️ Furnace not starting
- ⚠️ No heat from vents
- ⚠️ Clicking sound but no ignition
What the Technician Will Do
🔧 Professional repair required. Do not attempt DIY — this repair requires specialized tools or certification.
- 1 Check your owner's manual for model-specific guidance on error code reset procedures
- 2 Check that gas supply valve is fully open and gas supply pressure is adequate
- 3 Clean the flame sensor rod with fine steel wool — carbon buildup is the #1 cause
- 4 If the error persists after reset and basic checks, contact a qualified technician
⚡ Quick tip: Always try a full power reset first — turn the unit off at the breaker, wait 30 seconds, restore power.
Frequently Asked Questions
What does Lennox Furnace error code 227 mean? ▼
Error code 227 on a Lennox gas furnace indicates: Ignition lockout. The unit has detected this condition and has limited or stopped operation to prevent further damage.
How do I fix Lennox Furnace error code 227? ▼
Start by powering the unit off for 30 seconds and restarting. If error 227 returns, the underlying cause (ignition lockout) needs to be addressed. Check wiring connections and filters first before replacing components.
Is Lennox error code 227 serious? ▼
It depends on the root cause. Some 227 errors resolve with a reset. Others indicate a failed component that requires professional repair. Don't continue operating with this error — it can lead to further damage.