Pr00 Low

Johnson Starley Pr00 Fault Code

Also written as PR00 — same fault.

The Johnson Starley Pr00 fault code means: your boiler is currently set to its installer configuration mode, meaning it is waiting for a professional to adjust its internal settings.. It appears on 1 Johnson Starley model in our database.

Monitor it

This is a minor fault. Keep an eye on it and mention it at your next annual boiler service. Reset the boiler and see if it clears.

Technical description: Installer mode entry parameter
Typical repair cost £0-80 (including labour)

DIY fix possible

Press the Reset button once to exit the installer menuTurn the power to the boiler off and back on at the fused spur switchIf the code persists, avoid pressing additional menu buttons as this may alter calibration settings

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 Pr00 fault code

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

Source

Johnson Starley Pr00 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