@torsson11 - is there an external rain sensor on this setup? Several times users have reported a similar result and it turned out that there was a rain sensor that was not connected to the Rachio Sensor port that was breaking the common wire and preventing the current from reaching the solenoid.
If by “manual run at the source” one means activating the solenoid manually using the bled screw, then that narrows the error domain down to electrical based as water in the system and functioning valves have eliminated.
I do remember two posts where a) a rat/mouse chewed the wire in a valve box and b) a utility installer putting in an underground circuit cut the field wire.
Do you have access to a volt/ohm meter?