High Lockout
E167 on Baxi Duo-tec/Megaflo

Your boiler's computer control board has developed a communication fault and is unable to manage the system 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

Printed circuit board (PCB) error

What causes this fault?

This fault occurs when the boiler's internal computer brain fails to communicate with the rest of the system components. The most common reason is a hardware failure on the circuit board itself, though it can also be triggered by loose internal wiring or a sudden electrical surge that damages the sensitive electronics.

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

E168View →E110View →E160View →

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 →