The manual has been translated from German but patently not by a Brit.

The name of the game is persuading LED b20 to light show the guards are in place and allow the hydraulics to come on.

The manual says, "Magnetic read-contact on safety grid of the safety gate, activated by a magnet mounted to the stationary mould platen".

Do you reckon "read-contact" should be "reed switch"? If so I am good to stick my multimeter up it's yarris.

It is one, or more, of 3 sensors that is kaput.

#2 looks common or garden mechanical.

#3 is built in to a "Rexroth hydraulic interruptor". Sounds a bit Dr Who but has a little Perspex window and I can see what looks like a contactor going up and down. Hoping it isn't that one, too many screws for comfort.