! =?
OK I will test this.
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Rule Help Time
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A workaround which might work
when WRHeater.temp != 21 and [ [it is after 5:00 and before 8:00] or [it is after 16:00 and before 22:00] ] and every 5 seconds then set temp of WRHeater to 21
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I would say:
WRHeater.temp <= 21
28 degrees is also!= 21
but you don’t want the heater to start at that temperature.