High Lockout
262 on Worcester Bosch Greenstar 8000 Life/Style

Your boiler's internal computer has encountered a communication error or a software fault and cannot operate correctly.

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

System fault boiler electronics / basic controller

What causes this fault?

This fault occurs when the boiler's internal components stop talking to each other, similar to a computer crashing. It is usually caused by a glitch in the main control board or a loose connection in the wiring that prevents the system from booting up safely.

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

232View →

Related guides you might find useful

Boiler keeps cutting out

Lockout fault with a reset-needed pattern.

Read →

Yellow or orange flame — CO safety

Safety-critical — turn off, read this.

Read →

When to replace your boiler

7 signs repair isn't worth it anymore.

Read →