Water heater’s flue terminal shows signs of staining or water dripping

Safety: Flue work must comply with regulations. Only qualified engineers should alter flue systems.

• Inspect flue slope: Ensure the flue is installed with the correct fall back to the appliance or to the drain, as specified by Vaillant.
• Check joints: Inspect flue joints for signs of leakage or staining. Reseat or replace seals and sections as needed.
• Verify condensate drainage: Ensure the condensate trap and pipe are clear and correctly connected.
• Combustion check: Perform a combustion analysis to ensure the appliance is operating within specification.