What should I do if the console display shows CH0 or CH1 error messages?
You must recalibrate the resistance system. First, remove the batteries from the console. Next, press and hold any button on the console for 20 seconds. Then, release the button and reinsert the batteries into the console; the exercise bike will adjust to the lowest resistance level.
From the official ProForm Carbon CX Exercise Bike manual, page 17
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