BoilerFaultCodesWhat the manual says
Manufacturer manualHigh Pressure Sensor Error
What causes this fault?
This fault occurs when the system's internal safety sensor detects that the pressure levels have exceeded safe operating limits or if the sensor itself has failed. The most common reason is a restriction in the water flow through the unit, often caused by a blockage or a pump failure, preventing heat from being moved away quickly enough. It can also be triggered by an electrical fault where the sensor is unable to send a reliable signal back to the main control board.
This fault is more common during the first cold spells of autumn and winter when the system is under higher load after being idle during the summer.
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.
Avoid the next call-out bill
A cover plan would handle faults like H8: no call-out fees, no surprise bills.
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