What should I do if the pedals slip even at the highest resistance level?
The drive belt may need to be adjusted. Locate the Idler Cover, remove the M4 x 16mm Flange Screw and Idler Cover, then tighten the M10 x 50mm Screw until the Drive Belt is tight, and reattach the Idler Cover.
From the official ProForm Carbon CX Exercise Bike manual, page 22
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