E125 High
Your boiler has detected that water is not moving through the system correctly, which could be due to a blockage or a pump failure.
Technical description: Primary water circulation fault
Typical repair cost: £180-350 (including labour)
DIY fix possible
Check that your system pressure is between 1.0 and 1.5 bar on the pressure gaugeEnsure all radiator valves are fully openCheck if any bypass valves are closed
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
- Circulating Pump
- Diverter Valve
- Main Heat Exchanger (Descaling)
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