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Hello Renatoa,

After adding the jumper as you indicated, I configured the setup, following the vid of greencardigan (very good):
https://www.youtube.com/watch?v=0-Co-pXF2NM

In his video, I can see the value changing of the heater when moving the heater-slider, however, in my case, nothing happens there (see screenshot). Also the led on the SSR keeps blinking as before at a constant rate. So there is no interaction between the slider and the SSR yet...

Any ideas?

Thanks!