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Nano Troubleshooting

Applies to: CCTSS# · CSW

Missing AC icons on the screen​

The Nano home screen is missing the air conditioning control tiles.

Steps to resolve:

  1. Go to Setup → Services and ensure the AC service is not hidden
  2. If the AC service is absent, go to Setup → Find CPU to re-detect the C225
  3. Confirm the C325# AC interface module is correctly fitted to the C225 CPU

Screen is beeping and flickering​

The Nano emits a beeping sound and/or the display is flickering.

Steps to resolve:

  1. Beeping and flickering together usually indicate a communication fault between the Nano and the C225
  2. Check the Cat5e cable connection at both ends — re-seat firmly
  3. Try a different iZone Net port on the C225
  4. Ensure the cable does not run parallel to mains wiring (maintain ≥100mm separation)
  5. Replace the cable if the issue persists

Screen is frozen​

The Nano touch screen is unresponsive to touch input.

Steps to resolve:

  1. Hold the reset button on the rear of the Nano for 5 seconds to force a reboot
  2. If unresponsive, power cycle the C225 by disconnecting the CT24ACE transformer for 10 seconds
  3. If freezing recurs, check for and install any available firmware update: Setup → About → Check for Update

How to calibrate the touch screen (legacy CCTS — discontinued)​

note

This procedure applies only to the older CCTS controller (discontinued). It does not apply to the current Nano (CCTSS#).

  1. Power off the screen completely
  2. While powering back on, hold the touch screen at the top-left corner for 5 seconds until the calibration grid appears
  3. Tap each calibration point as prompted
  4. Once complete, the screen will return to normal operation