Dishwasher driving me nuts.

I have got a Bosch dish washer like yours, vivvq. I finally got the repair man in, who said my model had a pump that slowly failed rather than just stopping. He replaced it, but it still wasn't as good as it was when it was new

My next step was to stand in the kitchen in front of the DW and discuss its replacement with DH. It bucked up its performance immediately and, while not perfect, it is now performing acceptably. We are planning a kitchen extension so it will survive until the kitchen is replaced, but I will have a new one in the new kitchen.

First a word of warning our Beko lasted about 5years and then went on fire!!

Does your policy state that if the d/w can't be repaired then it will be replaced?
If so I would remind the insurers that you have had numerous call outs and the machine still does not work to your satisfaction.
If they are not helpful then maybe just keep calling them out until they provide you with as new one.

I no linger have extended warranty as the cost of 5 years cover would more than likely buy a new dishwasher.

The mechanic will have checked that water is flowing in properly, but perhaps you could check the tube again, and make sure the tap that supplies it is fully open. Always use the same make of salt, rinse and washing agent, is what I was recommended, and follow the dosing instructions. Try washing on the hottest wash possible now and again.

I've never heard of Beko.

I don't have a Beko but the man who came out to me said the best thing it should always have is dishwasher salt. Even if you don't put a rinse in it. I used to have to clear our jets with a pin as stuff built up, not just limescale, and we have very hard water. Have you tried a descale clean with a very hot wash, like you would a washing machine? And cleared the filter and drain at the bottom. I find our new one gets even fatty mayo stuck to it and needs a regular degrease. If you've done all this then maybe it is time to get a new one but 5 years isn't that long really. Good luck, hope you don't need a new one. I hate technology when it goes wrong!

If it's been no good for the past five years it's not going to suddenly perform well - probably time to cut your losses and buy a new one. Malfunctioning appliances drive me potty!