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MEDIUM URGENCY

York 11 Red Flashes — Limit Open Over 5 Minutes

11 red flashes

Limit switch open more than 5 minutes — usually failed blower.

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

What This Code Means

11 red flashes means the limit switch has been open for over 5 minutes, indicating a persistent overheating problem (usually a failed blower).

Likely Causes (Ranked)

Most common

Failed blower motor

What: Blower not running, heat exchanger stays hot.

How to check: Listen for blower at heat call.

Fix: Replace motor.

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Common

Failed blower capacitor

What: Capacitor failure prevents blower start.

How to check: Test capacitor with meter.

Fix: Replace capacitor.

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Less common

Faulty limit switch

What: Switch stuck open.

How to check: Tech test.

Fix: Replace switch.

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Diagnostic Steps

  1. Cut power
  2. Listen for blower at heat call
  3. Test capacitor
  4. Replace as needed

Frequently Asked Questions

Difference between York 4 and 11?
4 = brief limit trip; 11 = prolonged limit open, usually blower failure.
DIY?
Capacitor yes. Blower motor more advanced.
Same on Coleman?
Yes.

Related York Codes

York Error Code 4 Red Flashes

Related Symptoms

Furnace Blower Wont Turn OffFurnace Blower Runs But No Heat

Need More Help?

Try our interactive symptom diagnostic tool or browse York parts.

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