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.
E125 on current Baxi combis is a primary circulation fault. The boiler measured its own temperature climbing too quickly and concluded the water was not moving through it. So it shut down.
The causes run from easy to awkward. Low pressure or a closed valve after other work is easy. A sticking pump is harder. A heat exchanger partly blocked with sludge is harder again.
Sludge is common in older Brownhills systems that have never been flushed. Check the manual for your model.
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.
A pump or sensor swap is usually one visit. A system clean-out takes most of a day because the radiators are flushed one at a time. The engineer tells you which at the end of the diagnosis.
A photo of the display and the gauge. Tell us how old the radiators are and whether the water looked dark when you last bled one.
The boiler has shut down before overheating, so it is protecting itself. If you smell gas, that is different. Go outside, touch 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.
The cause. A valve left shut costs nothing to put right. A pump is a larger job. A flush takes the most time. You are told which it is before work begins.
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