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    No HW when only HW system is ON, HW available when CH is ON

    Could someone please advise on the possible root cause of this problem, as well as tell me where the solenoid valve actuator might be located? * Potterton Profile L Bolier * Grundfos pump * 1x Landis & Gyr, 1 x Honeywel Motorised Valves * Honeywell strap-on cylinder thermostat * Indirect...
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