BoilerFaultCodesTechnical description
Circulation error
What causes this fault?
This fault occurs when the boiler detects that water is not moving through the system quickly enough to carry heat away from the burner. The most common reasons are a failed internal pump that can no longer push the water, or a build-up of debris and sludge that has physically blocked the pipes or heat exchanger. Effectively, the boiler shuts down because it is getting too hot too quickly and needs to prevent internal damage.
This fault is more common in autumn and winter when the heating is first switched back on, as debris often settles and solidifies during the summer months when the pump is inactive.
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.