Low
1023 on Worcester Bosch Greenstar 8000

Your boiler has been running for a very long time without a proper break, likely due to a system management setting or a sensor error, and needs a reset to clear the accumulated timer.

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

Maximum run time including standby time reached

DIY fix possible

Locate the reset button or dial on the boiler front panelPress and hold the reset button for 3 to 5 secondsWait for the boiler to cycle through its startup routineIf the code persists, turn the boiler off at the mains for 10 minutes before turning it back on

Find a Gas Safe engineer
Search the official register →

Related guides you might find useful

Boiler keeps cutting out

Lockout fault with a reset-needed pattern.

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 →