111 High
Your boiler has reached its maximum safe temperature and has shut down to prevent overheating.
Technical description: Maximum limit of flow temperature
Typical repair cost: £100-£350 (including labour)
DIY fix possible
Check that your radiator valves are open and not turned to zero.Ensure your system pressure is between 1.0 and 1.5 bar on the pressure gauge.Press the Reset button for five seconds to restart the boiler.
Protect yourself from future repair bills
A boiler cover plan would cover faults like 111 — no call-out fees, no surprises.
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Parts commonly replaced
- Circulation pump
- Overheat thermostat
- Main heat exchanger
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