Mira Sport Shower Not Working

My mira sport 9 0 will not operate.
Mira sport shower not working. The power light on the shower does not come on when pushed. Click here for how to mend it. Repairs to mira mixer 722.
The bills for the electric immersion heater was very high so i recently removed the immersion heater and boiler and replaced it with a combi boiler. Water not heating up. Mixer unit mira722 not working.
There are no lights or noise from the sh read more. Click here for the repair. Mira sport 10 8 shower shower not working.
When the shower is switched on there is sound like th. We have had our mira sport shower about four years and it has suddenly started not heating the water up can what ever heats the water up be replaced or do we have to replace the shower unit entirely. In addition i had an electric mira sport shower which was in the en suite bathroom.
If the shower is completely cold the thermal switch is likely faulty. A multimeter can confirm whether there is continuity if not it ll need replacing. Stand by power indicator isnt lit although using a circuit tester the shower is recieving power just wondering if anyone knew of a common fault with these showers or is it a case of calling out an electrician.
There is power at the pullcord and the pullcord light comes on. Find out more at mira showers.