How to Repair Thermostatic Shower Valve

2. Using a flat head screwdriver, take off the cap of the shower handle to get access to the screw that you should remove using a Philips screwdriver. Beneath this screw, you will also find another screw that you also have to remove in order to remove the lever handle.

3. After you have completely removed the shower handle, it is time to remove handle faceplate. In doing so, see to it that you set aside the components you remove in a safe area in your bathroom, so you will not have any difficulty reassembling them later on.

4. By this time, you will be able to see a hole on the wall, which is part of the thermostatic valve. If there is a stop check valve, you will need to shut them off, and if there is not any, you need to completely shut off the main water supply to your home.

5. After ensuring the water supply is shut off, remove the valve cartridge. Take note that this component is shaped like a “U” in some units, and can be removed using a pair of pliers. For other units, they have bolts and nuts that you need to remove to take the cartridge off.

6. With the cartridge removed, you will now be able to remove the entire thermostatic system, along with the hose and shower head, from the water supply. Disconnect the hot and cold water supply from the valve to remove the actual valve itself.

7. Place the new valve where it should be. Simply replace the components in a reverse order when you removed them, turning the valve back on and re-installing the faceplate and handle.

8. Test if the problem is solved by turning the water back on and testing the temperature.

More Useful Tips

While thermostatic valves come in the more common manual form, they can also come in a digital electronic form. For the manual type, it uses heat-sensitive material, which expands with heat to restrict the flow of hot water. On the other hand, the digital electronic type have no moving parts to control the amount of hot water released, but instead use semiconductor devices, such as thermistors. Knowing which type you are having is important before you start the repair work.