Hello Viessmann Community! I have a Vitocal 200-S, installed in 2013. Occasionally I have needed to switch the unit off using the power switch on the indoor unit. When switching it back on again, the progress bar on the screen starts moving, the letters HWQC are displayed beneath it, the secondary pump starts and I can hear some relays activate. Then the pump switches off immediately and the progress bar starts again from 0. This process continues repeatedly for about 15 - 20 minutes and the unit then starts working. I would like to know if this is normal behaviour or if it's something that needs fixing. What does HWQC mean? Thanks for your help! Jonathan.
... Mehr anzeigen
