Posting a message to the forum will remove the above advertisement
  1. This site uses cookies. By continuing to use this site, you are agreeing to our use of cookies. Learn More.
  2. Checkout our Plumbers Insurance area - heavily discounted Public Liability Insurance and Van Insurance specifically designed for plumbers.

Discuss thermostatic turns cold after 3mins in the Plumbing Forum area at

  1. drainrod

    drainrod Member

    having nice hot shower then water turns cold for couple mins then hot again, cycle continues
    wb 35cdi 9yr old, BUT when heating not on shower runs nice and hot and doesnt change
    answers please
  2. scott_d

    scott_d Plumber GSR Top Contributor!!

    does it happen at other hot outlets?
  3. Craig Watson

    Craig Watson Plumber GSR Top Contributor!!

    What you need to establish is whether the boiler is cutting out when this happens. Run your shower as you normally would, but then go to your boiler and monitor how it functions. If the boiler cuts out then it's an issue within your boiler. If the boiler runs continually then the fault will be within the shower control.
    • Like Like x 2
  4. SimonG

    SimonG Trusted Plumber

    Drop shower off and check filters in addition to what Craig said above.
Similar Threads - thermostatic turns cold Forum Date
Shower thermostatic mixer tap issues Commercial Plumbing Forum Saturday at 9:16 AM
Thermostatic Mixer Shower Removing non-return valves (gravity fed) Bathrooms, Showers and Wetrooms May 11, 2019