Thanks for the help, I discovered the problem.

For some reason the specific GPIO output was activated from the hardware list (light bulb was on). So that was the reason that Domoticz was enabling the relay while the switch was toggled off.

I am using Domoticz now for more then a year to control my heating. I am running it on a Pi B+ and have a relay board connected on the gpio pins.

The issue which I have is that after a (re)start of domoticz one of the relais is getting activated, however the switch in Domoticz is not on. So when I ...