BoilerFaultCodesWhat the manual says
Manufacturer manualBoiler temperature exceeded (circulation pump or air locked)
What causes this fault?
This fault occurs when the water inside the boiler reaches an unsafe temperature because it isn't being moved away into your radiators or hot water tap quickly enough. The most common reason is that the internal pump has failed or is stuck, but it can also be caused by a large air bubble trapped in the pipework blocking the flow.
This fault often appears at the start of autumn when the heating is turned back on after being off all summer, which can cause the pump to seize.
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.
Avoid the next call-out bill
A cover plan would handle faults like E125: no call-out fees, no surprise bills.
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