How do you reset the error F4 Combi Boiler Viessmann Vitodens 100. Gas fault

[fucesor]

It works! Thanks man. Greets from Poland ;)

[TarekBouhaous]

I thank you sooo mutch it works. Greets from germany ❤️ you're the real hero

[SimonBosley]

I tried this and it attempted to reset, like it went through a few cycles of trying to start up. However it stopped then came up with the same error. My pressure is below 1, maybe that's the problem? How do I increase it?

[majajakubowska]

I did the same but after some time the same error shows up....