I know this is an old thread, but I wanted to follow up because I hate searching for questions only to find someone with the same question but no answer, or worse, they reply with "nevermind I figured it out" and don't post the answer.
Aeotec support was not able to help, but I figured out the problem on my own. When wiring something to 220V, you don't have a neutral (well, if you've got 3 wire plugs like I doi); You've got two live wires, one from each leg that carries 110v, and a ground. When the heat is running, current runs through both L1 and L2. However, the motor that spins the drum is only pulling from one of them. Which one specfiically? I don't know. I probably could have figured it out with my meter but I didn't feel like it.
My point is that the switch, when monitoring a device that is only pulling from one leg, only monitors one leg and not both. So I just had to switch the L1 and L2 wire on the live (not load) side of the switch and instead of dropping to 0W it drops down to the correct wattage now when the heat turns off.
