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MEDIUM URGENCY

York 7 Red Flashes — Ignition Lockout

7 red flashes

Locked out after too many ignition attempts.

Brand: York (Also covers Coleman, Luxaire)  |  Equipment: Gas Furnace

What This Code Means

7 red flashes means the burners failed to ignite after multiple attempts (typically 3), so the control locked out for safety.

Likely Causes (Ranked)

Most common (~50%)

Dirty flame sensor

What: Coated sensor can't detect flame.

How to check: Pull and inspect.

Fix: Clean with emery cloth.

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Common

Failed igniter

What: Igniter not heating.

How to check: Watch for orange glow.

Fix: Replace.

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Common

Gas supply issue

What: Closed valve or low pressure.

How to check: Test valve.

Fix: Open valve.

Less common

Faulty gas valve

What: Valve coil failure.

How to check: Tech test.

Fix: Replace.

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Diagnostic Steps

  1. Cut power 60s
  2. Watch heat cycle
  3. Clean flame sensor
  4. Replace igniter if needed
  5. Verify gas

Frequently Asked Questions

How to reset York 7 red flashes?
Cut power 60s. Lockout clears.
What fixes it most often?
Cleaning the flame sensor — 50% of cases.
Same on Coleman/Luxaire?
Yes — all Johnson Controls brands.

Related York Codes

York Error Code 1 Red FlashYork Error Code 12 Red Flashes

Related Symptoms

Furnace Not IgnitingFurnace Clicking Not IgnitingFurnace Pilot Going Out

Need More Help?

Try our interactive symptom diagnostic tool or browse York parts.

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