When Outside_weather temperature is below 11.0° ...
Turn on HeatingRequest_Flag
Rule and pending actions can run ...
Only between 16:00 and 19:00
however, this relies on a change occurring within the timeframe and if the temperature doesnt change within this time window the condition is never true (therefore output not getting activated).
My work-around is therefore to use rule-machine and at a preset time check if the temperature is below X to activate the heating.
Is there another way i can do it whereby if the temperature is below a setpoint within a time-window the conditions are met? (similar to the first example but doesnt rely on the need to have a shift in temperature value.
Could you screenshot your rule so we can see the whole thing? There are a couple ways to do this, it would be helpful to see where you are at before suggesting changes.
Given the parameters you state above, I think I would do this differently and poll the sensor, and limit the rule differently. To accomplish this, I would also use Rule Machine instead of basic rules.
[Required expression:]
Between 14:00 and 16:30
[Trigger:]
Periodic every 5 minutes
[Actions:]
IF Below 11 degrees (weather sensor)
Turn on Radiator 21 degrees
This would also allow you to do a ELSE IF action and turn the heat off if the weather sensor were to rise above a certain point, or if it were on and you did not need the heat. You would have to leave enough room to not have this rapidly cycle on/off, maybe set it to about 15 degrees? Not sure how fast the temp can change in those couple hours, so maybe that part is not necessary.