WATER PRESSURE TOO HIGH Medium

Johnson Starley WATER PRESSURE TOO HIGH Fault Code

Q: What does the Johnson Starley WATER PRESSURE TOO HIGH fault code mean?

Your boiler has too much water in the system, which can put unnecessary stress on the internal seals and pipework.

Q: How much does it cost to fix Johnson Starley error code WATER PRESSURE TOO HIGH?

Typical repair cost for the Johnson Starley WATER PRESSURE TOO HIGH fault is £90-180 including labour.

Also written as WATERPRESSURETOOHIGH — same fault.

The Johnson Starley WATER PRESSURE TOO HIGH fault code means: your boiler has too much water in the system, which can put unnecessary stress on the internal seals and pipework.. It appears on 1 Johnson Starley model in our database.

Technical description: Water pressure too high

Typical repair cost £90-180 (including labour)

DIY fix possible

Check that the silver filling loop valves are fully closedBleed water from a radiator using a radiator key to reduce pressureMonitor the pressure gauge to ensure it returns to between 1.0 and 1.5 barReset the boiler once the correct pressure is reached

Find a Gas Safe engineer

Search the official register for a qualified engineer in your area.

Gas Safe Register →

Johnson Starley models that show the WATER PRESSURE TOO HIGH fault code

Click a model for the full fault code list and model-specific repair notes.

J32 System ET Repair: £90-180

Source

Johnson Starley WATER PRESSURE TOO HIGH fault code information on this page is sourced and cross-checked against the official Johnson Starley service / installation manuals for each affected model.

Reviewed by the BoilerFaultCodes Editorial Team · Last reviewed 27 April 2026