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After a factory reset what would be the key settings within the installer level to re-adjust? The only setting im familiar with is Heat Curve

oh dear ^^ thats an option. But i can't see how it would be something really obscure, 999 options to check i guess. If no code works, then im assuming theres something else at fault.

yeah i was debating trying the factory reset If that would push it back to default Im getting the impression the code has been changed at some point but i'm not sure when or by who. 000 currently doesn't work either. If i do the full factory reset, would there be other important ...but mayb...

Hello, Got a bit of an issue trying to access the inestaller level on my thermostat for my Vailant combi boiler. I was told to go in to it to adjust/double check a setting (by a plumber friend) but I can't seem to get past the access screen. He said to put in code 17, but doing so and pressing...