How much does it cost to fix Vokera error code Test 3?

Typical repair cost for the Vokera Test 3 fault is £150-300 including labour.

Test 3 High

Vokera Test 3 Fault Code

Q: What does the Vokera Test 3 fault code mean?

Your boiler has detected that the internal mechanism responsible for clearing exhaust gases is not operating correctly, so it has safely shut down to prevent any unsafe build-up.

Also written as TEST3 — same fault.

The Vokera Test 3 fault code means: your boiler has detected that the internal mechanism responsible for clearing exhaust gases is not operating correctly, so it has safely shut down to prevent any unsafe build-up.. It appears on 1 Vokera model in our database.

Technical description: Fan fault

What causes the Vokera Test 3 fault?

This fault occurs when the boiler's control board cannot detect that the fan is spinning at the correct speed to safely clear exhaust fumes. The most common reasons are a mechanical failure of the fan motor itself or a blockage in the flue that prevents air from moving freely.

This fault is more frequent during periods of high winds, which can create back-pressure in the flue and prevent the fan from starting correctly.

Typical repair cost £150-300 (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 Test 3 fault code

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

Hydra Repair: £150-300

Source

Vokera Test 3 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 27 April 2026