It's gone faulty in protest...
I have some measured current draws from three S1 cars.
2.1Sd = constant 4mA
2.1Sed = 4mA with regular short pulse at 20mA
3.0-24 = 16mA wth regular short pulse to 20mA.
I can only think the Climate control panel draws some power to retain the settings, maybe the keypad does too. Neither have been checked.
On battery connection the Hydractive electrovalve energised for 30 seconds, with an initial inrush current of more than 2A, then 1.8A until switching off.
This could be used as a method of testing electrovalve operation if one can't hear them.
Presumably, due to having two electrovalves, H2 systems have double the current draw.