BoilerFaultCodesTechnical description
Water pressure sensor signal in the wrong range (too low)
What causes this fault?
This fault occurs when the boiler's internal computer receives an electrical signal from the water pressure sensor that is outside its expected range. The most common reason is a build-up of sludge or debris blocking the sensor's opening, though it can also be caused by the sensor's internal electronics failing or a loose connection in the wiring.
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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