Display shows 'ROL2' and heater locks out; indicates secondary rollout circuit open.

Safety first: As with any rollout fault, shut off gas and power immediately. Allow the heater to cool.

Steps to address ROL2 error:

• Locate secondary rollout switch: Identify the rollout switch on the opposite side or secondary location. Reset if it has a manual reset button.
• Inspect for flame marks: Look for scorching, soot, or melted insulation near the secondary switch area.
• Check burner alignment: Ensure burners are properly seated and not misaligned, which can cause flame to exit the front of the heater.
• Inspect flue collector: Remove access to the flue collector and check for obstructions or collapsed baffles that could redirect flame.
• Replace faulty switch: If the switch remains open at room temperature, replace with the correct Raypak part.

Warning: Persistent rollout errors require professional combustion analysis and inspection.