This page contains the information required to help repair and diagnose the fault codes being shown on the boiler display. The following information, will take you through the fault finding sequence or steps, for rectifying a Vaillant Ecotec boiler with this fault code. Suggested solutions will be detailed further down the page.
Models applicable to:
Gas valve actuation fault
The gas valve cannot be actuated
Cable harness supply line to the gas valve is defective (short to earth, short circuit)
Gas valve defective
Statistical chances of faults
There is a ~82% chance of the PCB being at fault
There is a ~4% chance of the Gas Valve being at fault
There is a ~14% chance of something else causing the fault.
Check the resistance across the gas valve for 50-54 ohms(+/-10%). If this correct, then likely the PCB needs to be replaced.
If the gas valve fails resistance test, then likely the gas valve needs to be replaced.
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