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13

Code 13 — Limit Circuit Lockout

Bryant · Air Conditioning

What does 13 mean?

The limit circuit has detected a potentially unsafe condition, likely overheating, and has locked out the system. The system will use heat pump heating if available.

Common Causes

  • Overheating condition
  • Faulty limit switch
  • Blocked airflow
  • Malfunctioning fan

Repair Steps & Checklist

Click steps to track your progress.

  1. 1

    Check for blocked air filters or return vents.

  2. 2

    Ensure all vents and registers are open.

  3. 3

    Verify the fan is operating correctly.

  4. 4

    Contact an HVAC technician if overheating persists.

Browse all codes in this manual (47)
Verified technical data. Last updated: April 2026

Related Faults

14Code 14 — Ignition Lockout15Code 15 — Blower Motor Lockout21Code 21 — Gas Heating Lockout
Source: Bryant Air Conditioning
Open Manual (Page 17)Search more codes in this manual