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:
Ecotec Plus, Ecotec Exclusive, Ecotec Pro
Gas valve switch-off delay
Delayed shutdown of gas valve detected– Secondary light (ignition and monitoring electrode indicates delayed extinguishing of the flame signal)
– Gas valve defective
– PCB 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.
Carry out local tightness test on the gas valve. If gas tight then then likely you may have to replace the PCB
Replace the gas valve
This fault commonly occurs alongside fault code F.61
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