Low Information
0.0 on Worcester Bosch Greenstar 25HE

This is not an active fault code, but a menu setting used by engineers to view the history of previous problems with your boiler.

Reviewed by the BoilerFaultCodes Editorial Team · Last reviewed

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

Last fault (displayed when a fault has occurred and navigating to service function 2.0)

What causes this 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 →

Related fault codes

2.0View →

Related guides you might find useful

Yellow or orange flame — CO safety

Safety-critical — turn off, read this.

Read →

Is boiler cover worth it?

Break-even maths on monthly cover.

Read →

When to replace your boiler

7 signs repair isn't worth it anymore.

Read →