BoilerFaultCodesYour boiler has detected that there is not enough water pressure in the system to operate safely.
Book a Gas Safe engineer within 24–48 hours. Your boiler may be unsafe or could break down completely if left.
Technical description: Low water or no water in appliance | Cause: No water in system, Pump defective, Pump lead defective
What causes this fault?
This fault occurs when the boiler's internal sensors detect that the system pressure has dropped too low for it to heat up safely. The most common reason is a slow leak in the radiators or pipework, but it can also be triggered if the circulation pump has failed and is no longer moving water through the heat exchanger.
This issue is frequently seen in autumn when homeowners turn their heating back on for the first time, as small leaks or trapped air can cause the pressure to dip over the summer months.
DIY fix possible
Check the pressure gauge on the front of the boiler or under the casing.Locate the external filling loop (braided silver hose) usually found beneath the boiler.Slowly open the valves until the pressure gauge reaches between 1.0 and 1.5 bar, then close them tightly.
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