BoilerFaultCodesTechnical description
Circulation error
What causes this fault?
This fault occurs when the boiler's internal sensors detect that water is heating up too quickly because it isn't being moved away from the burner fast enough. The most common reason is a seized or failing pump, though it can also be caused by a build-up of air or debris physically blocking the water's path through the heat exchanger.
This issue often surfaces in autumn when the heating is turned back on for the first time, as pump components can seize up after sitting idle during the summer months.
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.
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