We've had this one before from another post. Plastic internal by-pass shuttle needs replacing, common for this model. Only make sure you get a proper service agent (try if manufacturer can reccommend) or you may end up with some burke who thinks it's another printed circuit board fault.
Vokera do a cheap service kit with all the perishable hydraulic bits and pieces including the bobbin/washer making your screaming nose. Get someone to fit the whole kit in about an hour...
If you need to find a tradesperson to get your job done, please try our local search below,
or if you are doing it yourself you can find suppliers local to you.
Select the supplier or trade you require, enter your location to begin your search.
Please select a service and enter a location to continue...
Are you a trade or supplier? You can create your listing free at DIYnot Local