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Im not sure if you have the manual, so I have copied the exact reset instructions below
Replacing the Active HEPAfilterDo not use more than one exhaustfilter at a time.^Open the dust compartment lid.^Raise the filter and remove it.^Replace with a new filter, and push itdown into place.If you wish to replace the ActiveHEPA filter with a Super Air Cleanfilter see "Replacing one type ofexhaust filter with another".^Close the dust compartment lidfirmly. It should click into place.Resetting the exhaust filter changeindicatorThe filter change indicator needs to bereset each time the filter is replaced. Todo this the vacuum cleaner
must beswitched on.^Press the reset button.The exhaust filter change indicatorgoes out and resets to zero.The filter change indicator can onlybe reset by pressing the resetbutton after the light has come on.Pressing the button at any other timewill have no effect.
If this still doesnt work for you, it seems like its a bad board.
Can you tell me how old this is please?