Air source Heat pump Viessmann 100A PCB failure fault evident at installation. Taken 9 months to have this corrected. Cost for fault 2 months €600 euros 2 Bed terrace house with only one occupant. There are approximately 25 plus houses on site with the same fault. legionella system faulty.

No Hot Water / Heating, for over a week. kept getting F2 fault. service engineer said not to use it, he also said it needed a new pump which didn't make any sense. I phoned Viessmann on a few occasions expressing my concern that we had to wait over a week for a part I didn't think it needed anyway but still had to wait a week for the next engineer who actually worked for Viessman he agreed it was unlikely to be the pump and it ended up some plate that needed cleaning. The 111-W boiler is now fixed at a cost but unhappy that we was fobbed off for a week with no hot water or heating.

I love my new Vitocal heat pump so much! Installed by Heat Different, it looks great, and the Viessmann app is so easy to use. The hot water is always ready to use at just the right temperature, and I am using a quarter of the energy and creating no carbon thanks to a Green tariff. Goodbye polluting gas boiler, hello livable future for the planet! Thank you Viessmann for a quality product.

Would like to know more information on getting fault codes cleared on my air source heat pump. Codes F.793 and F.792. Was told by my installer that Viessmann would carry out a software update and this would clear these codes as the unit is continually flashing red. Apart from that very happy with our new heating system.

Great experience with Viessmann - had a regular service which went well, but unfortunately uncovered another issue immediately afterwards leaving us with no hot water. Viessmann got a remedial visit sorted the next day and now all working again. Shout out to our engineer Chris Brown who fixed it, did a great job, explained everything that had happened - thanks! Also had a good chat about the future of heat pumps, batteries etc.