Loaded more than one pellet by mistake?

Any sound at all when trigger is pulled?

Friend had issues with his HW110 and these folks sorted it with a service https://hw100tuning.co.uk/ would hazard a guess it'll be cheaper to get them to do it rather than Hull Cartridge once you factor in RFD fees, postage, and whatever HC will charge

Likely to be something very simple, Weihrauch are known for two things, ugliness, and reliability, if it's not working it'll be easy solved