Beatrice Lang
If your electric shower head has stopped working properly, you may be able to fix the thermostat yourself. Before you begin, ensure that the shower is isolated from the electrical mains and that the water supply is shut off. You can do this by turning off the power at the fuse board and locating the isolation valves for the hot and cold water supplies, turning them off. If you cannot find the isolation valves, turn off the mains water supply at the stopcock. Once you have ensured the area is safe, remove the shower handle and faceplate to expose the shower valve. If your shower has a hidden valve behind a wall or tiling, you may need to call a professional.
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What You'll Learn
Before starting, turn off the electricity and water supply
Before starting any work on an electric shower, it is imperative to prioritise your safety. Since you will be working with both electricity and water, the first step is to turn off the power in the project area. This is done by isolating the shower from the electrical mains. Start by turning it off using the pull cord or isolation switch, and then shut off the power at the fuse board.
Next, you will need to turn off the water supply. Locate the isolation valves for the hot and cold water supplies that feed your shower valve and turn them off. If your system does not have isolation valves, or you cannot locate them, you will need to turn off the water supply to the entire bathroom or possibly the whole house. This can be done by turning off the mains water supply at the stopcock.
Once you have turned off the electricity and water supply, you can proceed to remove the shower faceplate and handle. This will expose the inner workings of the shower, allowing you to access the thermostatic valve mechanism and begin the process of replacing the thermostat.
It is important to note that working on electrical projects, especially those involving water, can be dangerous. Always exercise caution and ensure that the power and water supply are turned off before beginning any repair or replacement work.
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Remove the shower handle and faceplate
Before you start, make sure you have the right tools for the job. You will likely need a few flat-head and Phillips-head screwdrivers, and possibly a pair of fine-nosed pliers. You should also ensure that the shower is turned off and that the electricity to the unit is shut off at the fuse board. It is also a good idea to take photos before and during the repair process, so you can refer to them when reassembling the shower.
To remove the shower handle and faceplate, begin by removing the cap from the handle with a flat-head screwdriver. This will expose a Phillips-head screw beneath. Unscrew this screw to remove the handle from the shower. Beneath this, there may be another screw for the lever handle itself, which you should also unscrew.
Once the handle has been removed, you should see the faceplate. Remove the faceplate by unscrewing any screws holding it in place. Be careful not to damage the faceplate or surrounding area, as this could affect the shower's performance.
With the faceplate removed, you should now have access to the shower valve. If there are stop-check valves where the hot and cold water supplies enter the valve, turn these to shut off the water supply. If there are no stop-check valves, you will need to turn off the water supply to the bathroom or the entire house.
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Disconnect the thermostat from the water supply
Before starting any work on your electric shower, it is important to ensure it is isolated from the electrical mains. Turn off the power using the pull cord or isolation switch, then shut off the power at the fuse board.
Next, turn on the shower and let the water run for around ten seconds to check for any leaks. Turn up the temperature until the water is hot, then turn off the shower and the power again. Inspect the unit for any drips or leaks, and if none are found, you can replace the cover and switch the power back on.
Now, remove the faceplate to the shower handle. You should now see the shower valve. If there are stop-check valves where the hot and cold water supplies enter the thermostatic valve, turn these to shut off the water. If these are not present, turn off the water supply to the bathroom or the entire house.
With the water supply disconnected, you can now remove the cartridge. There should be a U-shaped retainer mechanism that can be removed with pliers. Alternatively, there may be nuts and bolts that must be loosened before the cartridge can be taken out.
Finally, disconnect the thermostatic mechanism from the water supply, as well as from the shower hose and head.
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Remove the old thermostat and install a new one
Before you begin, it is important to take safety precautions. Turn off the power in the project area. You will be working with electricity and water, so take extra care.
Now, let's begin the process of removing the old thermostat and installing a new one. First, remove the faceplate from the shower handle. This will expose the shower valve. If there are stop-check valves where the hot and cold water supplies enter the thermostatic valve, turn these to shut off the water flow. If not, you will need to turn off the water supply to the bathroom or possibly the entire house.
With the water supply turned off, you can now expose the thermostatic valve mechanism. Remove the cartridge in the unit. Typically, there will be a U-shaped retainer mechanism that can be removed with pliers. Alternatively, there may be nuts and bolts that need to be loosened before removing the cartridge.
Next, disconnect the thermostatic mechanism from the water supply, shower hose, and head. With the mechanism disconnected, you can now remove the old thermostat. Loosen the wires connected to each terminal with a Phillips-head screwdriver. Once the wires are disconnected, remove the old thermostat from the electric shower head casing.
Before installing the new thermostat, ensure it has the same dimensions and specifications as the old unit. Install the wires on the new thermostat, mirroring how they were connected on the old one. Use a small, flat-head screwdriver to turn the screw on the new thermostat until it reaches the desired temperature setting (usually 38°C or 120 degrees).
Finally, screw the electric showerhead back into place and turn on the electricity to the unit. Test the shower to ensure the new thermostat is working correctly.
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Test the new thermostat and reassemble the shower
Before you begin reassembling the shower, ensure that you have replaced the thermostat with a new one of the same dimensions and specifications. Once the new thermostat is in place, turn the screw on the top of the thermostat with a small flat-head screwdriver until it reads 120 degrees.
Now, you can reassemble the shower. First, screw the electric showerhead back into place. Then, turn on the electricity to the unit. Before turning the shower on, ensure that the power in the project area is turned off. Once the power is off, turn on the shower and wait for the water to come through for around ten seconds, ensuring a steady stream of water. Next, turn up the temperature until there is hot water, and then switch off the shower.
Before finishing, switch the power off again, and take off the cover of the unit. Check for any drips or leaks inside the unit. If there are none, replace the cover, switch the power back on, and you're done.
To test the new thermostat, use a thermometer to check if the water temperature is correct and runs up to a maximum of 38°C. If the temperature is not 38°C, adjust the cartridge with the water running, until the water reaches 38°C. Once the temperature is correct, replace the thermostat head.
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Frequently asked questions
First, ensure that the electricity and water supply to the shower is turned off. Then, remove the showerhead and the faceplate to expose the shower valve. Disconnect the water supply and the shower hose and head from the thermostatic mechanism. Remove the cartridge and the old thermostat. Install a new thermostat with the same dimensions and specifications as the old one, and reconnect the wires. Turn the screw on the new thermostat to 120 degrees. Screw the electric showerhead back into place and turn the electricity back on.
You will need a Phillips-head screwdriver, a flat-head screwdriver, and a pair of pliers. A camera is also useful to take pictures before and during the repair process.
If your electric shower head has stopped working properly, you may have a thermostat problem. You can test this by turning on the shower and waiting for the water to come through. Then, turn up the temperature until the water is hot. Use a thermometer to check that the water temperature is 38°C. If it isn't, you may need to replace the thermostat.
Before carrying out any work on an electric shower, ensure that it is isolated from the electrical mains. Working with electricity and water can be dangerous, so take the necessary precautions.
