Baxi showing E125 in Brownhills? The boiler thinks water is not flowing round the system. The simple checks, and why sludge and pumps are the usual suspects.
Low pressure can cause poor circulation. If the gauge is well under one bar cold, top up via the filling loop as the manual shows, then reset once.
If anyone has worked on the heating recently, check the isolating valves under the boiler are open. A closed flow valve gives this code.
Radiators cold at the bottom, black water when you bleed them, or a boiler that sounds like a kettle all point at sludge in the system.
Pump operation, the pressure sensor, and flow through the heat exchanger. A clean-out and a filter often solve it for good.
The boiler has shut down before overheating, so it is protecting itself. If you smell gas, that is different: go outside, no switches, and call 0800 111 999.
That timing fits water not flowing fast enough, often a tired pump or a partly blocked heat exchanger.
If sludge is the cause, yes. The engineer can tell from the water and the radiators whether a flush is worth it.
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