High Lockout
E22 on Ideal Mini S15

Your boiler's internal computer brain has lost its configuration settings and needs a professional to reset or replace it.

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

Parametrizing error (PCB)

What causes this fault?

This fault occurs when the boiler's main control board suffers a memory glitch or software failure, causing it to 'forget' how it should operate. This is often triggered by sudden electrical fluctuations, such as a power surge or a failing internal wire harness that disrupts the data flow to the computer chip.

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

E02View →E05View →E15View →

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 →