I have a thermostatic shower, but I can only get it to be luke warm. The aquastat is set at 60, boiler at 165. The tap water in wash hand basin beside shower is very warm. I have taken the cover off the thermostat and there seems to be no adjustment. This seems to be the shower I have.

the thermostatic cartridge looks like enter image description here i have turned the spindle as far anti clock wise as possible but only turns one full turn is there an other way to adjust it enter image description here

1 Answer 1


Shower valves normally have a mechanism for adjusting the maximum water temperature under the handle. You'll have to consult the shower valve's manual for specifics. If you don't have the manual, here's a picture of a typical shower valve. The red part of the valve is the temperature safety. It is located under the shower handle and you rotate it to adjust the temperature.

enter image description here

Update: This document seems to describe the procedure to adjust the temperature of your shower. It looks relatively complex, but doable.

  • hi edwin i dont have a manual as i have just moved in but have taken the handle off and the spindle only turns one full turn.
    – Conor
    Commented Jan 16, 2013 at 20:48
  • See my updated answer. I think the linked document should get you to hot water.
    – Edwin
    Commented Jan 16, 2013 at 21:05
  • hi edwin i have tried that with no success. i am starting to wonder is the thermostat the problem or lack of water pressure as it isnt great c
    – user11121
    Commented Jan 16, 2013 at 21:24
  • Your shower valve could just be broken. Mineral buildup can sometimes interfere with the valve's operation. I had a shower valve that wouldn't allow any hot water to flow due to mineral buildup, and a soak overnight in vinegar fixed it. Commented Jan 17, 2013 at 3:23

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