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The problem is either something is interfering with the carrier movement OR the carrier homing sensor is broken/defective. First, turn off the power and manually move the carrier to the right side frame, check for foreign objects in the machine (pens, pushpins, paper clips etc.). Put some oil (10 weight) on a cloth and clean the chrome shaft that the carrier travels on.(by the rubber cogged belt). This is a common problem. If the sensor itself is the problem, take to a repair shop.(not common)