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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

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...