No, recently both sender and receiver apparently need to have enough (200?) posts to be able to use PMs. The purpose of this measure remains, as always, unclear. Just post here instead.
We have the Vento Ergo A50-1 Pro installed. We do not have a timer function. We switch it on and off manually with a remote control with a battery. It has been running well for 3.5 years, we are very satisfied. Initially, it disturbed Mr. Fachwerk a little for 2 weeks when falling asleep, after that it was okay.