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MEDIUM URGENCY

Lennox E270 - Soft Lockout, Max Retries Exceeded

E270

Soft lockout after maximum ignition retries exceeded - no flame current.

Brand: Lennox (Also covers Armstrong Air, Aire-Flo, Ducane)  |  Equipment: Gas Furnace

What This Code Means

Error code E270 on Lennox iComfort means the furnace exceeded its maximum allowed ignition retries without establishing flame. Soft lockout - auto-clears after 1 hour but the underlying problem must be fixed.

Likely Causes (Ranked)

Most common (~50%)

Dirty flame sensor

What: Sensor can't detect flame.

How to check: Pull sensor; check for coating.

Fix: Clean with emery cloth.

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Common

Failed hot surface igniter

What: Igniter not heating up enough.

How to check: Watch for orange glow.

Fix: Replace igniter.

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Common

Gas supply issue

What: Closed valve or low pressure.

How to check: Verify shutoff open; check other gas appliances.

Fix: Open valve or call gas utility.

Less common

Faulty gas valve

What: Valve coil failure prevents gas flow.

How to check: Tech valve test.

Fix: Replace gas valve.

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Diagnostic Steps

  1. Cut power 60s to clear lockout
  2. Watch heat cycle
  3. Clean flame sensor
  4. Replace igniter if no glow
  5. Verify gas supply

Frequently Asked Questions

How to reset Lennox E270?
Cut power 60s OR wait 1 hour for auto-clear. But fix the underlying issue or it'll return.
What fixes E270 most often?
Cleaning the flame sensor - resolves 50%+ of cases.
Same on Armstrong/Ducane?
Yes.

Related Lennox Codes

Lennox Error Code E240Lennox Error Code E241

Related Symptoms

Furnace Not IgnitingFurnace Clicking Not Igniting

Need More Help?

Try our interactive symptom diagnostic tool or browse Lennox parts.

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