BoilerFaultCodesVokera 70 Fault Code
The Vokera 70 fault code means: your boiler is struggling to accurately measure the temperature of the water circulating through your heating system, which has caused it to stop working for safety reasons.. It appears on 4 Vokera models in our database.
Technical description: flow NTC error (2nd CH)
What causes the Vokera 70 fault?
This fault occurs when the boiler's internal computer experiences a momentary communication glitch or receives an inconsistent reading from one of the temperature sensors. It acts like a temporary digital 'hiccup' where the main control board becomes briefly confused by the data it is receiving. If the issue persists, it usually points to a failing electronic control board or a sensor that is starting to wear out.
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 70 fault code
Click a model for the full fault code list and model-specific repair notes.
Source
Vokera 70 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