How to control pilot wires with x10 modules

[Gourmet]

I'd like to control radiants through their pilot wire using modules (x10, PLCBus) with triac (for their silence and their longevity).
But the tries I've made were unsuccessful: the module always stays on.
I can make it work using a resistance - in parallel with the load(*) - of about 15k (for a LM12). Of course it needs to be a 2 or 3W resistance and then it is very hot. By the way it's nonsense to be compelled to waste such and energy when the pilot wire only fueled a few mW (the impedance of a pilot wire is about 100k).
I'd like to understand where is the limit of a LM12 that makes it unable to deal with low intensities. I canceled a few capacitors but it didn't make anything. Does it have something to do with the internal current sensor or with slow start and stop?

So why?
Thank you very much if anybody could explain that to me.
db

[Han]

The LM12 needs a minimum load current to operate. The unit does not use the life and neutral directly for it's own electronics.

Han Alink

[Dowser]

Yes, the LM12 is not suited for that type of task since it needs a 60W load to function properly.
The UM7206 should be better suited for your needs.

//Markus