Furnace indicates flue or exhaust fault, burner stops, fan may continue to run

Safety first: Turn off power and gas. Risk of carbon monoxide – ensure the area is well ventilated and do not operate the furnace until the fault is resolved.

• Inspect flue terminal: From outside, check that the flue outlet is not blocked by debris, snow, nests, or vegetation. Clear any obstructions.
• Check flue joints: Visually inspect accessible flue sections for disconnections, sagging, or signs of condensation leakage.
• Examine flue sensor: Locate the flue gas temperature sensor on the flue collector or outlet. Ensure it is firmly mounted and the wiring is intact.
• Reset and test: After clearing obvious issues, restore power and gas, reset the furnace, and observe operation. If E07 returns, a professional flue gas analysis and inspection are required.

Warning: Flue gas problems are life-safety issues. If you smell exhaust or feel unwell, shut down the furnace and contact a qualified Roca technician immediately.