I spoke too soon.... The Toilet switches seem to work, and when the humidity sensor is above 65%, the ventilation goes on and the variable changes to '2'. But when it drops below 64%, the ventilation stays on and the variable doesn't change back to ''0'

Ok:-
WC - Light = Your Light switches (2 Yes?)
ExtractFan = Integer Variable
Extract Fan = Extract Fan

WC Light On.
"If" looks for either light switch to turn on. It also checks the value of the variable. If it's 0 then the fan is stopped and can therefore be turned on. When turned on the ...

If you right click the And/Or block you will see some options. Select "External Inputs".
(You would use 2 different devices for WC Light, but shown is just for reference to illustrate the And / Or scenarios.)
Sorry for the complexity, however, I have had a quick go at it and perhaps you can modify ...

Hi,
Below is my blockly that has been working nicely for over a year now. It has more complexity because it copes with 2 fan speeds on the humidity, as well as 3 position manual override, using a selector switch. Also it is conditional on occupancy.

The whole thing works due to the use of a ...

Eddiever wrote: Sunday 14 January 2018 14:19 And what if you just use If switch is on do Warmte Terugwin Unit = on for 15 minutes. Leave the option of the switch = off etc.

Then the same problem occurs. The humidity sensor is still below 64% and tells the ventilation system to go off

Eddiever wrote: Sunday 14 January 2018 13:32 I wouldn't do this in just one blocky. I suggest you could do it with three blocky's. One for the humidity, one for the lightswithc in toilet 1 and the last one for toilet BG.

Thanks for your fast reply!

That's what I started with, but had the exact same problem.

Hi,

I'm trying to create the following scenario:

* I want my ventilation system to switch on when my humidity sensor in the bathroom is above 65% and swithed off when it's below 64%.
* I also want the ventilation system to switch on for 15 minutes when one of the toilet lights are switched on ...