BoilerFaultCodesWorcester Bosch 0.0 Fault Code
Also written as 00 — same fault.
The Worcester Bosch 0.0 fault code means: this is not an active fault code, but a menu setting used by engineers to view the history of previous problems with your boiler.. It appears on 10 Worcester Bosch models in our database.
Technical description: Last fault (displayed when a fault has occurred and navigating to service function 2.0)
What causes the Worcester Bosch 0.0 fault?
This code appears when an engineer is accessing the boiler's internal memory to review its service history. It does not indicate a physical failure, but rather represents the 'mailbox' where the very last recorded error is stored for diagnostic purposes. If you see this, it simply means the system is being audited and there is no active mechanical breakdown currently triggered by this specific number.
DIY fix possible
Press the reset button to return the boiler to its normal display modeIf the boiler is working normally, no further action is requiredIf the boiler is not working, check for other flashing codes on the display
Find a Gas Safe engineer
Search the official register for a qualified engineer in your area.
Gas Safe Register →Worcester Bosch models that show the 0.0 fault code
Click a model for the full fault code list and model-specific repair notes.
Source
Worcester Bosch 0.0 fault code information on this page is sourced and cross-checked against the official Worcester Bosch service / installation manuals for each affected model.
Reviewed by the BoilerFaultCodes Editorial Team · Last reviewed 27 April 2026