Low
Fd on Worcester Bosch Greenstar 30si

Your boiler is perfectly safe and functional, but it has detected that the reset button was held down for too long, essentially pausing the system as a precaution.

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

Reset button pressed by mistake

DIY fix possible

Turn off the power supply to the boiler at the fused spur or mains switch.Wait for 30 seconds to allow the internal memory to clear.Switch the power back on and the boiler should resume normal operation automatically.

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 →