For Spirit treadmills the order is outlet (non-contact tester), power cord at both ends, rocker switch with a continuity tester, then the safety key. If all that fails then the inline fuse on the lower deck for XT/CT models, the thermal reset on the motor for XT685 model, or the lower board itself.
Spirit treadmills are some of the most well built treadmills on the market so when they do develop an issue it’s usually the cheaper parts that fail first.
For Spirit treadmills the order is outlet (non-contact tester), power cord at both ends, rocker switch with a continuity tester, then the safety key. If all that fails then the inline fuse on the lower deck for XT/CT models, the thermal reset on the motor for XT685 model, or the …