13 FLASHES
Ruud Flame Rollout Lockout

The status LED shows 13 flashes; the furnace may start but shut down on safety, and the blower may run continuously.

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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

A blocked heat exchanger or flue, a cracked heat exchanger, severe burner misalignment, or a rollout switch tripped and not resetting.

How to Fix / Troubleshooting

Critical safety: Flame rollout indicates combustion gases improperly leaving the burner area. Shut off gas and power immediately. Do not attempt to operate the furnace until inspected by a qualified technician.

Homeowner checks (visual only):

  • Look for tripped rollout switch: Some rollout switches are manual-reset. If tripped, there is a serious underlying issue. Do not repeatedly reset.
  • Check for visible obstructions: Ensure nothing is blocking the burner inlet area or the front of the furnace.
  • Call a professional: A Ruud-certified technician must inspect the heat exchanger, venting, and combustion air supply and perform combustion testing.
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Repair Difficulty

Professional Required 5/5

Required Part

Flame Rollout Switch
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