Attack Condensate / Flue Drainage Issue

Boiler flue terminal drips large amounts of water or stains the wall.

Safety Warning

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

Incorrect slope of Attack concentric flue, Blocked condensate drain from flue collector, Damaged flue seals, Excessive condensate due to low return temperatures

How to Fix / Troubleshooting

Safety: Condensate is mildly acidic; avoid prolonged skin contact.

Steps:

Inspect flue slope: From inside, check that the flue slopes slightly back toward the boiler as per Attack installation instructions.
Check condensate connections: Ensure the condensate hose from the flue collector to the trap is not kinked or disconnected.
Clean trap: Flush the condensate trap to ensure free flow.

Technician: Flue reconfiguration or seal replacement should be done by a qualified installer.

Repair Difficulty

Medium 3/5

Required Part

Condensate Trap

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