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BLTouch v3.1 not deploying after self test

BLTouch

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Hi,

I am having problems with my new BLTouch, its a v3.1 as opposed to the v2.2 I used previously. When I start the printer (with the hotend lifted) the BLTouch does its self test as expected and glows red (no blue in sight), however, once I try to start printing the pin does not drop and the nozzle crashes into the bed.

can anyone shed some light on the solution to this problem?

thanks