106 High
Your boiler has detected that there is not enough water circulating through the system or there is an air lock preventing flow.
Technical description: All Boilers
Typical repair cost: £80-250 (including labour)
DIY fix possible
Check the pressure gauge on the front of the boiler; it should be between 1 and 1.5 bar.If the pressure is low, use the filling loop underneath the boiler to top it up.Bleed your radiators to remove any trapped air that might be blocking water flow.
Protect yourself from future repair bills
A boiler cover plan would cover faults like 106 — no call-out fees, no surprises.
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Parts commonly replaced
- Circulation Pump
- Pump Lead
- Main PCB
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