BoilerFaultCodes.com
8.15 High

Your boiler has stopped working because the water pressure inside the heating system has dropped too low to operate safely.

Call an engineer soon

Book a Gas Safe engineer within 24–48 hours. Your boiler may be unsafe or could break down completely if left.

Technical description: Insufficient Water
Typical repair cost £80-150 (including labour)

DIY fix possible

Locate the filling loop (usually a silver braided hose with one or two valves) underneath the boiler.Open the valve(s) slowly to allow water into the system until the pressure gauge on the front of the boiler reads between 1.0 and 1.5 bar.Close the valve(s) tightly and restart the boiler.

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