This question is regarding Ultra Valquest DC70 Dual Valve Thermostatic Cartridge (20 Teeth) - DC70T20-M

extreme hot or cold shower

I'm not getting any adjustment though the shower valve's its either very hot or stone cold
Asked 7 years ago by Karl
Regarding the temperature fluctuation or cool running, it could be a faulty cartridge. However to check this if you have the shower fed from a combi boiler, see if you can get hold of the hot supply pipe before it enters the shower or perhaps as it leaves the boiler.


If when holding this pipe the temperature fluctuates or goes cool, then the problem is not with the shower but more likely with the boiler, as the shower can only deliver what the boiler sends to it.

Disregard the temperature at the taps as they have a different flow rate.

Answered 7 years ago by Barrie Seabright

View Product and Order Online:

Do you require any further help with Tap or Shower Cartridges?

Please click the following link if you would like to see other answers or ask a question regarding the Ultra Valquest DC70 Dual Valve Thermostatic Cartridge (20 Teeth) - DC70T20-M

If you've landed here and this question is not about your specific product, please take a look at these similar items on our Ultra Showers Cartridges page. Alternatively, if you're looking for any other brands you should view our full range of Cartridges.

If you would like to buy this cartridge or look others from the same brand, please view our Replacement Ultra Showers Cartridges (All)

For any other support request please get in touch.