@hmolineux said in Testing Power Fail and Resuming Print Issue:

It's an inductive probe.

I just noticed I might have my y offset reversed on the G31 line in my config.g . If the probe in located in front of the nozzle is this a positive y value in G31?

Are you sure that your inductive probe isn't triggering spuriously, perhaps because when you probe at the edge of the bed it is close to an extrusion or some other metalwork?

Usually, printers are set up so that +Y movement moves the print head away from you or the bed towards you. If your printer is set up that way, then if the probe is in front of the nozzle (closer to you than the nozzle), it has a negative Y offset.