I finally had chance to look at installing my HestiaPi, EU model.
I am UK based. I wanted to replace my thermostat, although we have a separate timer control programmer inside the boiler cupboard which I’ll keep. I am happy to only control heating anyway.
I initially wired everything up as directed, and when turned on saw the screen was flickering and rebooting, seemingly in a loop, so thought there was a power supply issue. I disconnected the blue Heating wire and tried again. I left it longer this time, and after a few reboots, it finally booted.
I then thought, perhaps it was working, and simply didn’t leave it long enough while all 3 cables were attached.
So reconnected to blue wire, and boom! The traces on L and H are gone! As per photos.
The only thing I can think I did differently was turn the power back on the breaker, and then turn the heating switch on the programmer very quickly, so this may have caused a serge?
I might tried to solder some wires back, unless there is something I am doing wrong?
The screen flickering and and boot cycles do not happen when testing with just the USB power. I retested after the indecent on USB again and it appears to still boot (without any cycles or flickering)
Photos of the wiring (and blown traces) are here:
Maybe on the diagram on the thermostat I am replacing, I have the wires messed up?
Old thermostat wiring diagram.jpg
I differed: Red = L, Yellow = N, and Blue = H.
Fortunately nothing else was damaged other than the 3A fuse for the central heating system, which was a bit difficult to replace at this time of year (several shops I went to were out of 3A!).