BoilerFaultCodesWorcester Bosch p/-.- Fault Code
Also written as P — same fault.
The Worcester Bosch p/-.- fault code means: your boiler is signalling an issue with the water pressure level, either because it has become too high or the sensor is failing to read it correctly.. It appears on 6 Worcester Bosch models in our database.
Technical description: The system pressure is too high (over 4.0 bar) or the pressure sensor has not detected a system pressure (boiler functioning normally).
Engineer required
This fault requires a Gas Safe registered engineer. Do not attempt gas-related repairs yourself.
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A cover plan would handle faults like p/-.-: no call-out fees, no surprise bills.
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Worcester Bosch models that show the p/-.- fault code
Click a model for the full fault code list and model-specific repair notes.
Source
Worcester Bosch p/-.- fault code information on this page is sourced and cross-checked against the official Worcester Bosch service / installation manuals for each affected model.
- Worcester Bosch GB162 manual (PDF)
- Worcester Bosch Highflow 300 manual (PDF)
- Worcester Bosch Highflow 550 CDi manual (PDF)
Reviewed by the BoilerFaultCodes Editorial Team · Last reviewed 7 July 2026