OTER Medium

Vokera OTER Fault Code

The Vokera OTER fault code means: your boiler is having a communication breakdown with its external thermostat or smart control system, meaning it doesn't know when to turn on or off.. It appears on 3 Vokera models in our database.

Book a service

This fault should be looked at by a Gas Safe engineer within the next week or two. It may get worse if left.

Technical description: OTBus configuration fault
Typical repair cost £120-250 (including labour)

Engineer required

This fault requires a Gas Safe registered engineer. Do not attempt gas-related repairs yourself.

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Vokera models that show the OTER fault code

Click a model for the full fault code list and model-specific repair notes.

Source

Vokera OTER fault code information on this page is sourced and cross-checked against the official Vokera service / installation manuals for each affected model.

Reviewed by the BoilerFaultCodes Editorial Team · Last reviewed 7 July 2026