E125 High
Your boiler is struggling to move heated water through the system effectively, which is causing it to stop for protection.
Technical description: Primary circulation fault
Typical repair cost: £180-450 (including labour)
DIY fix possible
Check that all radiator valves are fully openEnsure the boiler pressure is between 1 and 1.5 bar on the gaugeBleed your radiators to remove any trapped air pockets
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
- Plate Heat Exchanger
- Diverter Valve
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