Check the manual triggers on the solenoid.
They can be pushed to momentarily test the solenoid, or turned with a small screwdriver to lock them in place. If in the lock position the solenoid won't respond.
For normal operation both of the slots in the blue buttons should be oriented along the length of the solenoid body.
If they are perpendicular or sideways to the body then the solenoid won't respond.
You can just see the slots here:
