E5 218 High
Your boiler has shut down because the internal water temperature has become too hot, likely due to a lack of water flow or a circulation problem.
Technical description: Flow temperature too high
Typical repair cost: £120-350 (including labour)
DIY fix possible
Check if all radiator valves are open to ensure water can flow.Check the boiler pressure gauge and top up to 1.5 bar if it is too low.Restart the boiler using the reset button to see if the fault clears.
Protect yourself from future repair bills
A boiler cover plan would cover faults like E5 218 — no call-out fees, no surprises.
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Parts commonly replaced
- Circulation Pump
- NTC Flow Thermistor
- Main Heat Exchanger (Cleaning/Flushing)
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