Furnace shuts down and displays E05 after running for a short period; blower may continue to run.

Critical safety warning: A tripped rollout switch can indicate a dangerous combustion problem, including a cracked heat exchanger and potential carbon monoxide risk. If you suspect rollout, turn off the furnace and gas supply immediately and ventilate the area. Do not reset rollout switches repeatedly.

• Visual inspection: With power off, remove the burner access panel. Look for signs of scorching, melted wiring, or discoloration around the burner compartment and rollout switches.
• Check venting: Inspect the flue pipe for blockages, disconnections, or corrosion. Do not operate the furnace with a compromised vent.
• Reset (if manual type): Some Wolf rollout switches have a small red reset button. If there is no visible damage or scorching, you may press the reset once. If the switch trips again, shut down the furnace and call a qualified technician immediately.
• Professional evaluation: A technician should inspect the heat exchanger, burner alignment, and combustion air supply. If the rollout switch itself is defective, it must be replaced with the correct Wolf rollout switch model; never bypass or substitute with an incorrect rating.