BoilerFaultCodesTechnical description
Problem with condense trap/pipe/ sensor. Call engineer.
What causes this fault?
This fault occurs when waste water produced during the heating process cannot drain away from the boiler, causing it to back up inside the internal trap. The system detects this rising water level via a sensor and shuts down the boiler to prevent internal flooding or damage. The most common reasons are a blockage in the internal trap or an obstruction in the external pipework leading to a drain.
This fault is significantly more frequent during freezing winter temperatures, as the external waste pipe can freeze solid and prevent water from leaving the system.
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.