BoilerFaultCodesTechnical description
The condense trap/pipe has become blocked.
What causes this fault?
This fault occurs when the liquid produced by the boiler during operation cannot flow away, causing it to back up into the system. The most common reason is a blockage in the drainage pipe, often caused by a buildup of debris in the internal trap or ice forming in the external pipework.
This fault is significantly more common during winter, as the external condensate pipe can easily freeze during cold spells and prevent water from leaving the boiler.
Engineer required
This is a high severity fault. Stop using the boiler and call a Gas Safe registered engineer. Do not attempt gas-related repairs yourself.
Find a Gas Safe engineer
Search the official register →