Question about Bernina Sewing Machines
The problem is with either the upper or lower thread sensor. Could be either one has some lint or grime blocking it. If your machine is new the dealership tech should be taking care of this for you no charge. There are firmware updates that need to be installed on your machine that will narrow down the alert to either the upper or lower sensor. Its possible its just lint or dirt blocking it. The lower sensor is that black thing on the inside of the bobbincase door. Use a q-tip there. The upper sensor is a bit more difficult so just try blowing out up under where the tension spring is threaded. Also there may be a problem with the cable having gotten pinched or a plug has come loose. The sensors on these can go bad and need replacing, usually this is a warrenty item at no cost.
Be sure to get the new firmware updates installed and bring your BSR for its updates as well.
Posted on Jul 31, 2008
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Posted on Jan 02, 2017
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