Low
Autofroststat mode on Worcester Bosch 24i/28i Junior

Your boiler has detected very cold temperatures nearby and has turned itself on to heat up its internal components and prevent your pipes from freezing.

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

Boiler is running in frost protection mode because it is in a very cold environment.

DIY fix possible

Ensure the room where the boiler is located is kept slightly warmerCheck that no external windows near the boiler are left open during freezing weatherOnce the internal temperature rises, the boiler will automatically return to normal operation

Find a Gas Safe engineer
Search the official register →

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 →