BoilerFaultCodesVokera A09 Fault Code
The Vokera A09 fault code means: your boiler's internal computer brain is having trouble processing information and has temporarily stopped working.. It appears on 4 Vokera models in our database.
Technical description: RAM error
What causes the Vokera A09 fault?
This fault occurs when the boiler's main control board experiences a memory failure, preventing it from storing or reading vital operational data. It is typically caused by a hardware malfunction within the circuitry or an electrical surge that has corrupted the board's internal processors.
DIY fix possible
Locate the power switch or dial on the boiler.Turn the boiler off and wait for 60 seconds.Turn the boiler back on to see if the internal memory resets itself.
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Vokera models that show the A09 fault code
Click a model for the full fault code list and model-specific repair notes.
Source
Vokera A09 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