Low
305 on Worcester Bosch 35 RSF

Your boiler is temporarily finishing a hot water task before it switches back to heating mode.

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

The boiler is waiting for domestic hot water (DHW) operation to end

DIY fix possible

Turn off all hot water taps in the houseWait 2 to 5 minutes for the boiler to cycle through its shutdown phaseCheck for any dripping taps or leaking shower heads that might be keeping the demand active

Find a Gas Safe engineer
Search the official register →

Related fault codes

A7View →

Related guides you might find useful

No hot water but heating works

Almost always a stuck diverter valve on combis.

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 →