RunningAround

Hi folks We have a Stuart Turner Showermate eco 2 bar Twin Pump 46500 - was fitted back in 2018. All been fine until a week ago when it wouldn't turn itself off after a shower. Only way I could get it to stop was turning off power at the RCD in the airing cupboard. Since then - it won't do anything (I've changed the fuse in the RCD just in case). Is it worth getting someone to try and fix? Or, given the original cost was 145+fitting, better to bite the bullet and order a new one? thanks!