BoilerFaultCodesWhat the manual says
Manufacturer manualWater pressure sensor check is running, demand (DHW or heating) is blocked
Shared across the range
This code is shared by the boilers in this range, which use the same control board. It may not be printed in this exact variant’s manual.
What causes this fault?
This fault occurs when the boiler's internal computer tries to verify there is enough water pressure to run safely but fails to get a clear reading. The most common reason is a failing or blocked water pressure sensor that provides inconsistent data, causing the system to pause as a safety precaution.
Engineer required
This is a high severity fault. Stop using the boiler and call a Gas Safe registered engineer. Do not attempt gas-related repairs yourself.
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Related fault codes
All 52 fault codes on the Flexicom hx
Seeing a different code? Every code this model can display, in one place.