Relay dependency on high alarm

[MakoShark2]

I've setup a fan area which pulls out air to lower humidity when the high alarm humidity is reached, and it work fine.

I've added a heat lamp area to keep the temperature on a desired level.

The high alarm of the fan area has a "none on" dependency of the heat lamp area, in order to not pull the heat out.

But it doesn't seem to obey the rule.

The fan is operated with an on/off relay
The heat lamp is operated with a dimmer which fluctuates the intensity as needed.

I must be confusing something here...

[MakoShark2]

OK, it seems the dependency works if the dimmer state is at 100%, anything bellow that is considered as off.

Is there any way to change this behavior?... I would expect that if the heat lamp is producing any heat than the fan should be off.

Thanks.