What things are linked to the er1 light. I'm assuming this is error 1. I had the spindle motor worked on and now I have this er1 after reinstalled. My Google searching didn't bring much up on it. I did find something that hinted to that being an over temp alarm? The place that did the motor didn't leave me with much confidence in the work. It took them 5 months to "fix it and all they did was replace the bearings and the sensor in the motor.