13 FLASHES
York
Limit Circuit Lockout / Rollout or Auxiliary Limit Open
Furnace LED shows 13 flashes; unit may not start or may shut down unexpectedly.
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Safety Warning
This repair may involve working with high voltage components or water connections. Always unplug the appliance before removing any panels.
If you are not confident in your ability to perform this repair safely, we strongly recommend contacting a professional technician.
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Possible Causes
Flame rollout switch tripped, Blocked heat exchanger or flue, Cracked heat exchanger causing flame disturbance, Faulty rollout switch
How to Fix / Troubleshooting
Critical safety: A tripped rollout switch indicates flames leaving the burner area. Do not repeatedly reset rollout switches without finding the cause. Risk of fire and carbon monoxide.
- Visual inspection: With power off, remove burner door and inspect around burners and heat exchanger for soot, scorch marks, or melted wiring.
- Check rollout switches: Locate small manual-reset switches near the burners. If tripped (button popped), do not reset until a professional inspects the furnace.
- Vent and heat exchanger: Check vent for obvious blockage at the termination. Do not disassemble the heat exchanger yourself; this requires a technician.
- Do not operate: Leave the furnace off and contact a licensed HVAC technician immediately for a full combustion and safety inspection.
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Repair Difficulty
Professional Required
5/5
Required Part
Flame Rollout Switch
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