Hi, welcome to Just answer
It seems that the pressure switch is stuck or faulty...you will have to unplug the appliance and then take the top off the unit, the pressure switch which can be identified by a thin tube attached to it...take off the tube and then blow as hard you can, make sure the hose is clean and then with a screw driver give good tap on them so everything is cleaned...after this try to run a cycle, if the problem remains then it can be due to faulty pressure switch or a defective control board
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have you also tried to tap on the switch with a screw driver ?
very likely the problem is with the pressure switch or the control board itself
How old is it ? Do you hear any different sounds from the washer ?
Well looking at the age of the unit and also after whatever you have already done it is probably the board that is bad
and yes better to buy a new one as replacing the board will cost around £190
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