BoilerFaultCodesYour boiler has detected a leak or a failure in the internal seals that keep the water system watertight, which will likely prevent the unit from operating safely.
Book a Gas Safe engineer within 24–48 hours. Your boiler may be unsafe or could break down completely if left.
Technical description: ‘O’Rings/Seals Kit - Water Components
What causes this fault?
This fault occurs when the boiler detects an internal water leak or a significant drop in pressure caused by failing rubber seals within the pipework connections. Over years of constant heating and cooling, these internal O-rings can perish or become brittle, eventually allowing water to seep into areas where it shouldn't be. The boiler's sensors identify this loss of integrity or the presence of moisture and shut the system down to prevent electrical damage or flooding.
Engineer required
This fault requires a Gas Safe registered engineer. Do not attempt gas-related repairs yourself.
Find a Gas Safe engineer
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