High Lockout
08 on Vokera Easi-Heat 29

Your boiler has detected an internal electronic error or a communication failure that requires a manual reset or professional diagnostic check.

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

Final fault code (Refer to section 7.11)

What causes this fault?

This fault occurs when the boiler's internal computer suffers a critical communication failure or a software glitch. It is usually caused by the main control board failing to send or receive signals correctly, or by a loose connection in the wiring harness that links the electronic components together.

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

01View →02View →03View →

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 →