It’s probably the level float sticking. The level float is sited at about the 5 o’clock position in the sump . Remove the small circular grey cover and the float runs up and down a channel underneath it.
Remove the float , clean it thoroughly and then really clean out the small channel it runs up and down in. You’ll probably find it bunged up with grease and gunge .
Replace the float…..***IMPORTANT TO MAKE A NOTE OF THE ORIENTATION OF THE FLOAT SO IT GOES BACK IN THE RIGHT WAY UP***
Hopefully that’ll clear the fault for you