A reed switch or in some cases a speed sensor is locate by the front roller/pulley it could cylindrical or square looking.First you need to unplug the unit, then remove motor shroud inspect the reed switch to pulley distance ( no more than 3 credit card thickness) also inspect the pulley to see if the magnet is still attached to it. make the necessary adjustment. plug in the unit start it up. If it give you the same code then replace reed switch!
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