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How annoying. I think this has the same group head as the Classic so might be worth checking the following (assuming the pump is working):
-empty the machine and put it on its back
-take the shower screen off, which needs a short Philips screwdriver
-undo the two 5mm Allen key bolts and remove the aluminium disc. This might be stuck if it hasn’t been off before
-you’ll see a small hole where the water is pressurised out the boiler. This is probably scaled up and blocked. You can poke it clear with a small Allen key or similar, then run a load of descaler through it with those two components removed. It’ll probably spit out quite a lot of crud.
I bought used Gaggia Baby Twin. It was working fine until I tried to backflash it. Since then, the water does not flow through the group head (the wand still works). I tried to fix it using the guides on internet, but with no luck and I got enough. I am happy to sell it for £50.