Potterton showing E125 in Oldbury? It points at a circulation fault, where water is not moving through the boiler properly. Checks and next steps.
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Look at the gauge. If it has fallen, top up using the filling loop as the manual explains, then reset once.
Make sure the radiator valves around the house are open. A system with most of them shut cannot move the water.
Radiators cold at the bottom are a sign of sludge. Mention it when you get in touch.
The pump, the flow through the heat exchanger, the pressure and the quality of the system water.
A system flush and a magnetic filter keep the water clean. On older Oldbury systems that is often what stops E125 returning.
E125 on a Potterton usually means a circulation fault. The boiler saw the temperature climb too fast, which tells it the water is not flowing through the heat exchanger as it should. It stops before it overheats.
Low pressure, a sticking pump, closed valves and sludge are the common causes. Check the manual for your model, as meanings can differ.
Potterton boilers turn up across Oldbury, Langley and Rowley Regis, often on systems that have had the same radiators for decades. Those older radiators shed rust over time, and that sludge is a frequent cause of E125.
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Learn more →No. The boiler stopped because the water was not moving properly. If there is a smell of gas, go outside, do not flick any switches, and phone the National Gas Emergency number, 0800 111 999.
That fits a sluggish pump or a partial blockage. Both are common and worth fixing early.
Once, after checking the pressure. If it comes back, leave it off and get it looked at.
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