E125 High
Your boiler has detected that hot water isn't moving through the system properly, which is likely caused by a blockage or a pump issue.
Technical description: Circulation fault (primary).
Typical repair cost: £150-£350 (including labour)
DIY fix possible
Check if all radiator valves are openEnsure your boiler pressure is between 1.0 and 1.5 barTry resetting the boiler to see if the error clears
Protect yourself from future repair bills
A boiler cover plan would cover faults like E125 — no call-out fees, no surprises.
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Parts commonly replaced
- Circulation pump
- Diverter valve
- System filter
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