Vokera Sabre 29HE Common Problems & Fault Codes (2026 Guide)

The most common Vokera Sabre 29HE problems

The faults most likely to send a Vokera Sabre 29HE into lockout — with plain-English causes, what to check first, estimated repair costs and whether you need a Gas Safe engineer.

This model is discontinued. Parts can be harder to source and expensive. If repair costs are mounting, a new A-rated boiler may be the smarter choice.

The 6 most common faults

DHW NTC fault Engineer

ON at 50 °C / OFF at 55 °C

Full guide for DHW NTC fault

ON every 6-secs Engineer

At stand-by with no faults

Full guide for ON every 6-secs

Flashing 8-times a second Engineer

SARA function active

Full guide for Flashing 8-times a second

ON every 0.5-secs (Green LED) Engineer

Temporary fault, e.g.: APS fault, low water pressure

Full guide for ON every 0.5-secs (Green LED)

Solid (Green LED) Engineer

Active for heat/DHW request

Full guide for Solid (Green LED)

ON every 0.5-secs (Yellow LED) Engineer

CO function active

Full guide for ON every 0.5-secs (Yellow LED)

Call a Gas Safe engineer if…

You can smell gas or see signs of a leak
The Vokera shows an Emergency or High severity code
The boiler keeps locking out after repeated resets
You've tried the DIY checks and the fault hasn't cleared
There's visible water leaking from the boiler
The flame is yellow or orange instead of blue

See the full 9-code list for the Vokera Sabre 29HE