105 High
Your boiler has likely stopped working because there is an issue with water not circulating properly, often caused by trapped air or a blockage.
Technical description: All Boilers
Typical repair cost: £100-£350 (including labour)
DIY fix possible
Check that your boiler pressure is between 1 and 1.5 bar on the gauge.Try bleeding your radiators to remove any trapped air from the system.Ensure all radiator valves and isolation valves under the boiler are fully open.Reset the boiler by pressing the 'Reset' button.
Protect yourself from future repair bills
A boiler cover plan would cover faults like 105 — no call-out fees, no surprises.
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Parts commonly replaced
- Circulation Pump
- Main Heat Exchanger
- Automatic Air Vent
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