Thermostatic and Manual replacement cartridges for all Aqualisa shower models
If water is dripping from the showerhead, leaking from the controls or you have lost control of the temperature
then you will need a new cartridge
Best policy in general replace like with like
Aqualisa have been using the same design of thermostatic cartridge with coiled metal strip for nearly 40 years. Many of the originals were black and had several metal parts, todays are mostly plastic and come with grey, pint, green or orange bands and the top. These cartridges are not made to be repaired they must be completely replaced. They fail based upon age, amount of use or because limescale has impeded their ability to react. Sometimes they just give up by themselves, other times introduction of a new boiler or water heating system provokes the failure. The safest approach is usually to replace like with like, except where you know what has prompted the failure (eg new combi boiler, introduction of a pressurised water system) where a different colour cartridge would be preferable.
aqualisa showers are different from most others since both the temperature and the flow are controlled by the same part, consequently problems with either temperature or flow requires replacement of the same part. Aqualisa cartridges are sealed units and no separate sub components are available.