Hi! Sorry for posting in English but my German language is not as good as English. I have Vitodens 200-W which was bought on 04.2022. I have also A.18 warning and F.540 error I have I.93 warnings I opened two tickets in service center: three months ago for I.93 warning - still no info from viessmann after one technician visit. two weeks ago for A.18 and F.540 as my installation stoped working because of burner lock. Viessmann technician checked combustion chamber. The combustion chamber was dry, so the technician poured 1 liter of water inside, the condensate flowed out without problems. They recommended replacing the ionization electrode. Now I'm waiting for a replacement. We'll see if it helps but after reading this thread my hopes are low. In my case I also noticed that if the wind outside is strong I have more A.18 error if there is no wind outside I have no A.18 errors. P.S. F160 error is probably error after viessmann technician visit they disconnected HMU.
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