If nothing comes on whatsoever then chances are you may have a broken common wire.
We were at a job today where the back came on, but the front didn’t. The fact that the back came on eliminated the possibility of it being the master solenoid.
It had to be a common wire (or all 3 solenoids had died at the same time).
As is often the case a brief search revealed a wire sticking out of the ground that shouldn’t have been there. A dig in the area revealed its other half and when they were re-joined ‘voila’ the whole system kicked into gear.
Sometimes its a simple solution, but you need to know where to look.