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i have just had to drain my system again to fit a new motorised valve, & this morning woke up to find 4 out of my 5 downstairs rads cold, i have shut off all the hot rads upstairs & the rads are warming up but are still tepid at the bottoms any clues guys?

when i first start up the heating it will switch on & off via the timer buttons but at the end of the day will not switch off by the timer (in fact the switched live is still sending a signal even though no lights are displayed), i keep hearing about motorised valves, yes it is a "s"plan but...