I knew it had to be something simple like that! There are 4 dip switches, the first one is not used but I'd moved that one by mistake. I've looked at the back off that 20 times without noticing.
What a numpty.
Hopefully that fixes the power up problem finally.
Thanks
Hi
I've a baxi solo boiler fed by a water tank in the loft, pumped system. I had a problem last year where first thing in the morning the CH would only come on if the HW was due to come on as well. No great issue as you normally set it up so they both come on before you get up.
Later in...