I have a twin valve thermostatic shower. An overhead "rainfaill" style head and a smaller hand held one on a hose. Been having problems with the overhead shower going hot and cold. Removed , cleaned and recalibrate the temperature cartridge but it's still intermittent. The hand held nozzle seems fine, keeps a steady temperature. It also comes out at a higher pressure whereas the overhead seems a lot weaker. Could this be a problem with the diverter valve or because the overhead is higher up? Had the combi boiler checked and told it is okay. Thank in advance for any advice.
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