3711 Thermostatic cartridge replacementThe thermostatic cartridge seldom fails and the possibility of blocked filters should be investigated beforecontemplating replacing it. Small particles of water borne debris may still find their way past the strainersand onto the filter screens on the thermostatic cartridge. These should be cleaned and re-fitted, see below.To replace the thermostatic cartridge:ISOLATE WATER SUPPLIES FIRST, drain downthe pipe work as much as possible.1. Prise out the handle cover (L -shaped) see 6.2.2. Remove handle screw.3. Pull off the temperature control handle.4. To remove the temperature handle carrier (grey plasticmoulding), slide the black serrated lever clockwise andpull off. This will expose some of the thermostatic cartridge.5. Gently pull off the chromed shroud. The plastic mouldingthat supports the shroud may slide off with the shroud, ifnot, pull this moulding off too. This will expose theremainder of the thermostatic cartridge.The moulding should have two o-rings fitted.6. Unscrew cartridge with a 24mm A/F deep socket, expect some trapped water toescape. Replace the cartridge if necessary. When refitting cartridge, do not overtighten, hand tighten the first few threads, maximum torque 16Nm.ENSURE PARTS ARE REASSEMBLED IN THE CORRECT SEQUENCE.Refer to 6.2 for assembling handle.To clean the screens remove the o-rings shownThe sreens will then slide off. When clean replace thesreens then the o-rings which should be lightly greased witha WRAS approved silicone grease(eg Kluber Unisilikon GBU2