Water heater is leaking from the flue or producing visible steam around the flue connection.

Safety: Risk of flue gas leakage. Do not operate the heater until the flue is sealed correctly.

• Inspect flue joints: Check all visible flue connections for gaps, misalignment, or missing seals. Reseat and secure clamps as per Termet instructions.
• Check condensate drain: Ensure the condensate trap and drain line are clear so that condensate does not back up into the flue.
• Verify slope: Confirm that the flue has the correct slope back to the heater (for condensing models) to allow condensate to drain.
• Replace gaskets: Replace any damaged or hardened flue gaskets with original Termet parts.
• Professional inspection: Have a qualified technician perform a combustion and flue gas tightness test after repairs.