5 FLASHES
Ruud Flame Sensed with Gas Valve Off / Flame Rollout or Grounding Issue

The status LED shows 5 flashes; the furnace attempts ignition, but the burners shut off quickly, then it retries.

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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 tripped flame rollout switch, a flame sensor shorted to ground, a miswired or shorted gas valve circuit, or a cracked heat exchanger causing flame disturbance.

How to Fix / Troubleshooting

Safety: A flame rollout or heat exchanger issue is serious. If you see scorch marks, melted wiring, or smell strong combustion fumes, shut off gas and power and contact a licensed HVAC technician immediately.

Steps to check (homeowner level):

  • Inspect rollout switches: With power off, locate the manual reset rollout switches near the burner compartment. If a rollout switch has a small red reset button, press it once to reset. If it trips again, do not continue to reset—call a technician.
  • Check for visible soot or scorching: Look around the burners and front of the heat exchanger for black soot, discoloration, or melted components. These are signs of improper combustion.
  • Inspect flame sensor wiring: Ensure the flame sensor lead is not pinched or touching metal, which can cause false flame detection.
  • Do not attempt heat exchanger repairs: Heat exchanger inspection and replacement must be done by a qualified Ruud service provider.
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Repair Difficulty

Professional Required 5/5

Required Part

Flame Rollout Switch
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