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Thanks Diwali for your great reply. I had exactly the same symptoms as you. I tried yesterday, as you suggested but unfortunately my impeller was totally jammed and refused to budge, and broke when I applied more torque! I tracked down that I got the naughty pump from Screwfix in Jan 2021...

Thanks Johntheo5 for the response. Since my post i have been in contact with Grundfos who have told me to get a replacement from my supplier under warranty, so I will try that route first. If that fails (cos at the moment I dont remember who I got it from!!) I shall take it apart again and...

OK, I have got the pump head off with allum keys! But the only bit to come off is the part with the electric coil. The bit with the impeller is still attached and doesnt seem to want to be pulled off. Do i just keep pulling?

I have exactly the same problem Diwali. I was about to take off the pump head but cant work how to take out the 4 bolts that hold it in, they dont seem to be allum keys type. Anyone know what type they are?