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Faulty shower? Here's a step-by-step fix!

Faulty shower? Here's a step-by-step fix!


Ed Barros of Tooting-based Permanex Plumbing. is back with some invaluable advice on faulty showers. Take it away, Ed...

People often call us about their shower not working properly. The most common faults are that the temperature cannot be adjusted or that the shower constantly drips. So here's a step-by-step guide on how to identify and replace a faulty shower cartridge.

Every shower is slightly different – the one in the pictures below has a two way diverter at the top (for shower head and hand-held spray), the on/off valve in the middle and the temperature thermostat at the bottom.

Before working on the shower, you will need to isolate the hot and cold water supplies. Open the basin and kitchen taps to drain water out of the pipework – however, be warned that there’ll often be a small amount of residual water left in the shower.

To remove the handles simply unscrew the spigot anti clockwise (1).


This will reveal a grub screw underneath which can be removed with an allen/hex key (2).

You do not need to remove the grub screw, just loosen it enough so you can pull away the handle and remove it.

Once all the handles are removed, take off the fascia plate by prising it away from the wall from each edge. If the fascia has been siliconed to the wall, it may be necessary to use a small knife to cut through the silicone (3).


Thermostatic showers will often have a temperature stop ring. It's a good idea to take a picture of this before removing so that you can put it back in the same position when putting the shower back together (4).

To expose the cartridge, unscrew the chrome collars (which should only be hand tight). It is not advised to use tools to do this as you will scratch the surface of the chrome (5).


Lastly, use an adjustable spanner to remove the thermostatic cartridge which will unscrew anti-clockwise (6).

The same applies to the on/off valve – use an adjustable spanner to remove the valve either for identification or for replacement should you have the correct part (7).

Once the cartridge is replaced, simply re-attach the collars, fascia plate etc (essentially repeating the above steps in reverse order) and you’re done!

More details in our video here:

If you have any questions about this or any other plumbing or heating issues, please don't hesitate to give us a call. We often give free advice over the phone!

Remember, Permanex are offering 10% off your total bill when you mention Tooting Daily PRSS!

Permanex Plumbing and Maintenance Ltd is a 24/7 Tooting-based plumbing and maintenance service and one of our Community Partners. Call them on 020 8879 7372, find out more on their website, and follow them on Twitter, Facebook and Instagram. Find out more about our Community Partners here.

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