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MEDIUM URGENCY

Carrier Code 13 - Limit Switch Lockout

Code 13 (1 short + 3 long flashes)

Limit switch lockout after repeated overheating trips.

Brand: Carrier (Also covers Bryant, Payne)  |  Equipment: Gas Furnace

What This Code Means

Code 13 on Carrier (Bryant, Payne) means the control has seen repeated limit switch trips (code 33) and entered hard lockout. Persistent overheating problem - usually airflow restriction.

Likely Causes (Ranked)

Most common

Dirty air filter

What: Restricted airflow causes repeated overheating.

How to check: Inspect filter.

Fix: Replace filter, cycle power.

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Common

Failed blower motor

What: Weak blower can't carry heat away.

How to check: Feel airflow at register.

Fix: Test capacitor, replace motor.

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Less common

Faulty limit switch

What: Switch fails open or trips at low temp.

How to check: Tech tests resistance.

Fix: Replace switch.

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Diagnostic Steps

  1. Cut power 60s to clear lockout
  2. Replace filter
  3. Open all vents
  4. Check blower operation
  5. Call tech if persistent

Frequently Asked Questions

Difference between Carrier code 13 and 33?
33 = single limit trip (auto-clears). 13 = locked out after repeated 33 trips.
How to reset?
Cut power 60s. Fix airflow or it returns.
Same on Bryant/Payne?
Yes.

Related Carrier Codes

Carrier Error Code 33Carrier Error Code 34

Related Symptoms

Furnace Keeps Shutting OffFurnace Short Cycling

Need More Help?

Try our interactive symptom diagnostic tool or browse Carrier parts.

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