High Lockout
37 on Vokera Easi-Heat 29

Your boiler has detected that the internal fan is spinning too fast, which is preventing the system from starting safely.

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

fan error (high rpm)

What causes this fault?

This fault occurs when the boiler's control board detects that the fan is spinning at a higher speed than required for safe combustion. It is typically caused by a failing hall effect sensor within the fan motor or a software error on the main circuit board that can no longer regulate the voltage correctly.

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

34View →

Related guides you might find useful

Banging / kettling / whistling noise

Each noise points to a different fault.

Read →

Boiler keeps cutting out

Lockout fault with a reset-needed pattern.

Read →

When to replace your boiler

7 signs repair isn't worth it anymore.

Read →