Not Givenergy but I think a fair few here have Daikin.
On Wednesday I used the App to switch my
HP off. Come evening I opened the App but it did not connect to the system. Short story, I removed HP from Cloud and added the Device back. All settings restored.

Long story, I have limited ability to access the MMI so rang Octopus for help. While I was chatting with them I got a phone call from Robert Heath 0333 014 1000

I rang them back and they handle Daikin amongst others and they helped fix my App. I was very impressed that they called me even while on the phone to Octopus.

Just saying