On bad advice our builder installed a no brand/cheap built in shower mixer in our new bathroom 5 years ago.
It has stopped working - and the water is almost impossible to adjust to the right temperature - and changes temp when other taps in the house are turned on/off.
We have been told that we should replace the whole thing - which would mean cutting open the wall etc. etc.
I can't even figure out how to access the cartridge.
Do we need to replace the whole unit or can the cartridge be cleaned/replaced?
Thanks for any advice.