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CUSTOMER COMPLAINING THAT RADIATORS ARE HEATING WHEN TIMECLOCK SET TO OF AND THERMOSTAT DOWN TO 0. AT TIME OF VISIT ALL IS WORKING OK. ahhhhhhhhhhhh CHECKED ALL SWITCHES DIVERTOR VALVE TIMER ALL WORKING OK AT TIME OF VISIT. DIVERTOR VALVE DOING JOB WHEN HOT WATER ON (IE NOT FLOWING ROUND...