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The sensor(s) is not connecting to the controller correctly, only dashes are shown on the controller main screen.

 

Why is my TrolMaster sensor not connecting?

A TrolMaster sensor that won't connect is most commonly caused by a faulty cable, loose connector, or non-standard RJ-12 wiring — and in most cases the controller and sensor are fine. Work through the steps below in order to isolate and resolve the problem before requesting a replacement.

How do I troubleshoot a TrolMaster sensor connection problem?

Your TrolMaster system uses RJ-12 hardwired straight-through cables across all devices and sensors — any deviation from that standard will break the connection. Follow these steps in order to isolate the fault:

  1. Confirm you are using a straight-through RJ-12 cable that matches the Trolmaster standard.
  2. Inspect all cables and Y-splitters for loose connections and check the pins for any signs of moisture or corrosion.
  3. Connect the sensor directly to the controller sensor port, bypassing any Y-splitters or extension cables.
    • If the sensor connects successfully, the problem is with the cable or Y-splitter — replace the faulty component and retest.
    • If the sensor still does not connect, the issue may be with the controller sensor port or the sensor itself — proceed to the warranty step below.
How do I request a warranty replacement?

If the direct-connect test confirms a faulty sensor, request a warranty replacement by emailing support@trolmaster.com  support@trolmaster.com / support@trolmaster.eu with your purchase receipt and device serial number. The sensor must be undamaged and within the warranty period for your region.

  1. Verify the sensor is undamaged and within your region's warranty period.
  2. Locate your purchase receipt and the serial number printed on the device label.
  3. Email support@trolmaster.com / support@trolmaster.eu and include:
    • Your purchase receipt.
    • Your device serial number.

Don't let a sensor fault become extended downtime — work through these steps systematically and get your monitoring back online.