E42 High

Vokera E42 Fault Code

The Vokera E42 fault code means: your boiler has stopped working because one of its internal temperature sensors has developed an electrical fault and is reporting incorrect information.. It appears on 1 Vokera model in our database.

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: Outlet probe short-circuited

What causes the Vokera E42 fault?

This fault occurs when the electrical sensor that measures the water temperature exiting the boiler fails or loses its connection. Over time, heat exposure or moisture can cause the sensor's internal wiring to break down or short-circuit, preventing the boiler from knowing if it is safe to continue heating.

Typical repair cost £90-160 (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 E42 fault code

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

Source

Vokera E42 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