Sams RSH5UBMH not producing ice

Hi Folks

Hope someone can help. It has a flex tray dispenser and when the test button is pressed it appears to operate correctly, ie rotates to dumping position, rotates back then fills with water. In use however it does none of these. I’m guessing it’s a sensor issue (the one located at the end of the tray?), or perhaps control module. The sensor seems not to be available separately and I’m reluctant to take a punt on a complete ice maker assy or control module. Any hints and tips? What resistance should I get from the sensor at room temp etc?

Derek