This question is regarding Meynell Safemix Sm1 Thermostatic Mixing Valve - Shower Spares

Meynell SM1not shutting off

Shower will not turn off, when I turn the knob it springs back and water continues to flow out. I've tried removing the knob to check for limescale etc but I can't get it off and removing the grub screw makes no difference. How do I access the parts behind the knob? And is it neccesary to turn off the water supply to do this?
Asked 12 years ago by Anonymous

The valve probably needs a strip down clean lube and a service kit fitted

http://www.showerdoc.com/shower-spares/meynell/MEYN-PARENT-21-Meynell-Safemix-Sm1-Thermostatic-Mixing-Valve

http://www.showerdoc.com/shower-spares/meynell/MEYN-SPSK0020J-Meynell-Seal-Kit-(o0-Onwards)---Components-Identified-A-SPSK0020J

 

However removing the knob can be an issue.

 

 In the first instance try a few kettles of boiling water over it, this may just expand it just enough to help it come off, you could try heat from say a gas torch however you gave to be careful not to damage the chrome, on some occasions our engineers have had to cut the knob off with a hack saw and then replace the knob.

Answered 12 years ago by The Shower Doctor

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