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New shower mixer intermittent

Discussion in 'Plumbing and Central Heating' started by archibas, 8 Mar 2021.

  1. archibas

    archibas

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    I have fitted a new shower thermostatic mixer to supply a ceiling rainfall shower. The hot is supplied from a vented hot water tank with an inline pump in the loft, the cold from the water tank also in loft. When switching on mixer there is sometimes no water flow. I turn the cold fully on the cold flows then turning back slowly the hot starts and pump kicks in. Once set it is fine until you leave for a while then nothing again... Any ideas !! I have checked without shower being connected to shower outlet (thinking pressure drop going to shower head) but its the same.
     
  2. Gasguru

    Gasguru

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    Sounds like insufficient head to trigger pump....look at the manual and have a measure of the height differences.
     
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  4. archibas

    archibas

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    The hot pump is in the loft about 1.3M above valve. Pump has a max head 6M. Shower about 1.2M above valve and cold tank 1.4M above. Valve operates low pres 0.1 to 1. Just don't understand why its intermittent
     
  5. archibas

    archibas

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  7. Gasguru

    Gasguru

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