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Discuss Shower mixer too hot in the Plumbing Forum | Plumbing Advice area at PlumbersForums.net

John Williamson

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34
We have a shower which has always been too hot no matter how you adjust the mixer temperature but recently it's really burning hot.

The shower is in a loft conversion and the plumbers teed off a downstairs shower to feed the bathroom upstairs. There are two isolation valves downstairs for hot and cold and when I isolate the hot, there is just a trickle of cold in the shower whilst the sink next to the shower has full cold pressure.

Am I right in thinking the most likely suspect is a faulty shower mixer? I cannot see any visible isolators after the downstairs shower and the fact that the sink has a full flow makes me think it's likely something after this.

Trying to do some detective work to avoid ripping off some very large and expensive tiles
 

John Williamson

Messages
34
Could be a partially blocked inlet filter on the cold, that’s where I’d be looking first.
Thanks a lot Ben. So I did some experimenting (and got a bit wet).

  • I removed the thermostatic cartridge after isolating the hot and cold. When cold is turned on it flows freely through the hole where the cartridge was.
  • Put the cartridge back in with the hot still isolated, lovely cold water pressure through the shower head
  • Turned the hot back on, cold disappears and it's boiling hot no matter what direction you turn the thermostat

Now thinking that I might get away with replacing the cartridge. I've found what looks to be an identical one

You don't have permission to view attachments. Attachments are hidden.

Here:
cartridge replacement

Expensive part but cheaper than a new shower and less hassle than ripping tiles off. Think it's worth a punt?
 

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Ben-gee

Esteemed
Plumber
Messages
2,343
First check all the dimensions on yours against the very comprehensive diagram on that page, also count splines etc.

Look inside the brass body and check for scoring/ damage, in particular where the o-rings go.

Clean up the body as best you.

If everything looks ok and the cartridge dimensions match, then yes it’s probably worth trying it.
 

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