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I've replaced a thermostatic cartridge but it is still leaking?
Bi-metallic Cartridges: (similar to that pictured)
If the leak is coming from the shower head in the form a constant drip, this is likely due to the hot o'ring being incorrectly positioned, damaged or not renewed. These models have had 2 different designs of valve body during their production as well as solid brass bodies. The hot o'ring is installed differently with each design...
2 piece valve bodies (1979 - 2004) Also includes Aquastream MK2:
Identified by a large square fixing plate which fixes to the wall, the hot o'ring must be placed in the back of the body inside the groove. To remove the old o'ring, this is best hooked out using something like a dental pick - older o'rings may have hardened and could break up so it is important to ensure it has been fully removed before replacing it with the new one.
1 piece valve bodies (2004 - current) Also includes Aquastream MK3:
Identified by 4 corner fixing points which fix to the wall, the hot o'ring must be fitted on the end of the tube running inside the metal coil. Before fitting the o'ring, the white circlip should be fitted first inside the groove on the end of the tube as this supports the o'ring to ensure it seals when the cartridge is pushed into the valve body.
Solid brass bodies (Aquatique and Aquavalve 700 models):
The hot o'ring must be placed in the back of the body inside the groove. To remove the old o'ring, this is best hooked out using something like a dental pick - older o'rings may have hardened and could break up so it is important to ensure it has been fully removed before replacing it with the new one. Due to machining tolerances, an oversized hot o'ring may sometimes be required although the majority of time, the one provided is sufficient.
If the hot o'ring has been correctly positioned and the shower is still dripping, please check the o'ring for any signs of damage.
In the case that the o'ring is not the issue, it may be due to the valve body itself and requires changing. Sufficient access of 130-150mm will be required behind the wall plate to replace this.