Here is a chart showing the contact arrangement for the many different switches we use. There is a cross-reference from the manufacturer’s part number printed on the switch to our internal part number. Match your switch with the chart, and check it with a meter. If it tests out per the chart, it is not defective. However, your controller may need different contacts than the switch provides. Compare your controller schematic with our other switches to find one that better suits your needs. If you still have questions, contact the Customer Service Department for assistance.