Shower cartridge alignment help required -water hot then cold new cartridge ?

[Si_1976]

I have a Sagittarius blade bl172 concealed thermostat shower with a faulty cartridge, Sagittarius have kindly sent me a replacement but I have put it in as normal as there is no markings on the cartridge I can see but when I shower the water goes hot and then cold and somebody said I have not aligned cartridge properly when putting it in hole but how do you do this as no obvious markings on cartridge. Can somebody help have attached pictures ?.

 

[Plumbstar Tom]

From your symptoms pleas check your hot and cold are the right way round. Ie hot on the left inlet

The cartridge needs to be placed in and the retaining nut fitted. Then turn the shower on (don't for the temp handle) and find the showering temp and place the handle on with 38degrees or what ever is marked on it at the top