Junkers Condensate / Flue Leak

Water heater leaks from the flue condensate drain or around the flue connection.

This repair may involve working with high voltage components or water connections. Always unplug the appliance before removing any panels.

If you are not confident in your ability to perform this repair safely, we strongly recommend contacting a professional technician.

Possible Causes

Blocked condensate trap or hose, Incorrect flue slope, Damaged flue gasket, Cracked condensate collector

Safety: Condensate is mildly acidic; wear gloves and eye protection.

Check condensate hose: Ensure the hose from the condensate trap to the drain is not kinked or blocked. Flush with water if necessary.
Clean trap: Remove and clean the condensate trap according to the manual, removing sludge and debris.
Verify flue slope: The flue should slope slightly back to the heater for condensing models; incorrect slope must be corrected by an installer.
Inspect gaskets: If water appears at flue joints, have a technician replace flue seals.

Medium 3/5

Condensate Trap / Flue Gaskets

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