I have a Potterton Gold HE Combi Boiler. Does it make a difference if my Aqualisa Aquarian cartridge is a manual one instead of a thermostaic one? I've got an issue with a lack of hot water coming through the shower. Is it obvious, (i.e the cartridge), or could it be something else?

Anyone? Thank you in advance. :0)

Savvas John Savva, January 2010