High
H07 on Worcester Bosch 35 RSF

Your boiler has detected that there is not enough water pressure in the system to operate properly, which is preventing it from heating your radiators or providing hot water.

Reviewed by the BoilerFaultCodes Editorial Team · Last reviewed

Call an engineer soon

Book a Gas Safe engineer within 24 to 48 hours. Your boiler may be unsafe or could break down completely if left.

Technical description

The current water pressure is too low, limiting the performance in heat mode as well as domestic hot water (DHW) mode

Engineer required

This is a high severity fault. Stop using the boiler and call a Gas Safe registered engineer. Do not attempt gas-related repairs yourself.

Find a Gas Safe engineer
Search the official register →

Related fault codes

224VView →

Related guides you might find useful

Boiler keeps losing pressure

Six most common causes of dropping pressure.

Read →

No hot water but heating works

Almost always a stuck diverter valve on combis.

Read →

Low pressure — repressurise guide

Step-by-step using the filling loop.

Read →