Display shows 'ROL' and heater locks out; burner may have lit briefly before shutdown.

Safety first: A rollout condition is serious and can indicate a fire hazard. Turn off gas and power immediately. Do not reset repeatedly without finding the cause.

Steps to address ROL error:

• Inspect rollout switches: Locate the rollout switches near the burner compartment. Some are manual reset (small red button). If tripped, press to reset after the heater has cooled.
• Check for soot and blockage: Remove burner access panel and inspect burners and combustion chamber for heavy soot, debris, or spider webs. Clean or have a professional clean as needed.
• Inspect flue/vent: Ensure the venting system is not blocked by nests, leaves, or collapsed sections. Verify proper termination and clearances.
• Check draft (fan‑assisted models): Confirm the inducer fan runs smoothly and that the vent pressure switch closes. A failed fan can cause poor combustion and rollout.
• Test rollout switches: With power OFF, check continuity across each rollout switch. Replace any that remain open after cooling and reset.

Warning: If you see signs of flame escaping the burner area, melted wiring, or heavy soot, stop and call a qualified gas technician. Do not operate the heater until the cause is corrected.