Its probably a 3300 they are very proprietary somewhat hard to work on without Schindler training I have installed several of these units when I worked for them and they are so different than any other Schindler equipment did they leave any job books or prints there should be a small 5x7 book that tells you what the error codes mean without that your screwed there should also be a book that shows how to do all the test and some wago jumpers for testing the brake
