Thermostatic Shower Repair: Not Enough Hot Water

hand adjusting shower thermostat
  • 1-2 hours
  • Beginner
  • 25-35
What You'll Need
Deep socket wrench
Screwdrivers (Philips head and flat head)
What You'll Need
Deep socket wrench
Screwdrivers (Philips head and flat head)

If you're experiencing problems with the amount of hot water you're getting from your thermostatic shower, the problem might be the thermostatic shower valve. This component is what controls the flow of the water through the showerhead.

It's also the control for how much water you are receiving with the water flow. There really isn’t enough difference between regular shower systems than there is with a thermostatic shower system, so if you are pretty good at DIY projects, you shouldn’t need any professional help to fix your heating problems.

Follow the simple instructions below to replace the thermostatic shower valve with a new piece.

Step 1 - Remove the Handle

Use your flat head screwdriver to take the cap off of the handle. You will see the Philips head screw that you can unscrew to remove the shower handle. Under this screw, you will find yet another screw that you can unscrew to remove the lever handle.

Step 2 - Remove the Faceplate

After you have removed the handle completely, remove the handle faceplate. Make sure that you keep all the parts you have taken off in a safe space so you can reassemble them later.

Step 3 - Check the Valves

Once the faceplate has been removed, you will see a hole in the wall behind which is the thermostatic valve. If you see stop check valves near the thermostatic valve, you will need to shut them off at this time. If you do not see any stop check valves, you must completely shut off the water supply to your house.

Step 4 - Remove the Valve Cartridge

After you have shut off the water, you will need to take off the valve cartridge. In some units, this component is U-shaped and can be removed with pliers. Other units have nuts and bolts that attach to the cartridge; you must remove these pieces to get the cartridge off.

Step 5 - Remove the Valve

Completely remove the thermostatic mechanism from the entire water supply, as well as the hose and showerhead. Disconnect the hot and cold water from the valve. Use your wrench to shut them off. After you have done this, remove the actual valve itself.

Step 6 - Finish and Test

Attach your new thermostat valve where it belongs. Simply put the new valve on in reverse order than when you took the old one off. Turn the valves back on, replace the faceplate and handle. Then test your work by turning on the water and testing the temperature.