Their might be high friction between the belt and deck thus causing the error 1 code when your husband is on it. Try lubricating the area between belt and deck using silicone lubricant ( refer to owners manual). Then the lighter of the two "aka wife" walk on the treadmill for about 5 to 10 minutes.
This should take care of the problem if not then their is an issue with the belt and deck ( 85% of problems on treadmills are belt and deck related)
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