Mira Shower not pumping out water

I was down at my daughters house yesterday and they have this Mira pumped 9kw QT Elite shower , the on off switch at the front was not latching and had to be held in - my daughter ordered a new latching switch for it.

Easy job, undo 4 screws for the case , pull case off remove 2 screws on the piece of plastic that holds the latching switch, attached the switch with the spade terminals, didnt even have to solder the wires on . - put all the casing back on "That was quick/easy dad". After all the casing put on, and the shower hose connected switched shower on, no water flowing through - "Pump sounds sick Dad" - "yeah its OK its just got some air in there , when it purges through and water starts flowing through the pump will sound as normal" - waited and waited, no water coming through shower head. turned off because the pump motor was starting to smell a bit.

Off came the cover again - there is a leak from the usual elbow with the clips on from the pump and water was trickling out down by the filter plug - didnt order an elbow , but she said that it had been leaking ages like that but shower was still working with it like that, just had to hold the latching switch in because that was faulty.

"When was the last time filter taken out " - "never done it" … OK so I unscrewed filter, clear as a bell . stuck my finger up the filter hole the water flowed out with a lot of air and some brown water "that should do it now" - nope , still no water coing out of shower head. I removed head as well just in case blocked shower head, still no water flowing out. I removed the whole shower hose just in case hose had a blockage - nope.

while the case was off I hit the solenoid a few times. - still no water flowing . i touched metal casing of solenoid it was hot to the touch - if i had more time I would have put a mulitimeter up to the solenoid to check it , I couldnt hear solenoid opening and closing , but then again the pump was so noisy I wouldnt have done anyway .

I will have to look at it another day when i have more time, and look to ordering the leaking pump elbow, but I just cannot see how the shower was working before but you just had to hold in the latching switch , and all I done is replacethe faulty latching switch and now the shower will not pump out water now.

any other ideas?

thank you.

Andy.