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Nova / Nova Mini Troubleshooting

Applies to: CCAS#W · CCASLW · CCASLWE · CCASSW · CCASSWE

Before you start

Make sure the Nova firmware is up to date: Menu → Settings → Nova Settings → iZone → Nova Controller → Check for Update

Screen is blank or unresponsive​

The Nova or Nova Mini touch screen fails to power on or shows no image.

Steps to resolve:

  1. Check the power supply (CTDC12) connection to the Nova wall controller
  2. Check the Cat5e cable between the CSL Screen Link Module and the Nova — try a different port on the CSL
  3. Re-pair the CSL to the C225 CPU if the connection has been lost
  4. Replace the cable if the issue persists
  5. If still unresolved, the CSL or C225 CPU may need replacement — contact your installer

Zones are not opening or responding​

One or more zones are unresponsive when commanded from the Nova wall controller.

Steps to resolve:

  1. Move the zone motor cable to a different port on the C225
  2. In the Nova app, go to Setup → Configure AC → Options → Skip Zone Port (password: wamfud) and skip the faulty port
  3. Verify the CT24ACE transformer is powered and outputting ~24VAC
  4. Check all wiring connections are fully seated
note

On Daikin systems, it can take up to two minutes for dampers to open after a command is sent.

Nova controller not communicating with C225 CPU​

The Nova wall controller shows no connection to the system.

Steps to resolve:

  1. Confirm the COCBH Smart Hub is powered and the Nova shows the Wi-Fi symbol
  2. Re-pair the CSL to the C225 if pairing has been lost
  3. Ensure the Smart Hub was not connected to the internet modem before commissioning — if it was, disconnect it, factory reset the COCBH, and recommission
  4. Add a wireless repeater (CR) if the Smart Hub is out of range of the C225

Temperature sensor not showing actual temperature​

A zone shows no temperature reading despite having a sensor fitted.

Steps to resolve:

  1. Press the button on the sensor — if no lights appear, replace the battery (CR2032)
  2. If the sensor flashes instead of showing solid red or blue, re-pair it: press and hold the pair button, then pair through Menu → Devices in the iZone app
  3. Ensure the CDTS in-duct sensor is installed upstream of all dampers in the supply air duct
  4. Check the sensor is not obstructed by furniture or exposed to direct sunlight

iZone Hub not connecting to Wi-Fi / internet (Optus modem)​

The COCBH Smart Hub connects locally but fails to reach the internet when an Optus modem is in use.

Steps to resolve:

  1. Log into the Optus modem admin panel and disable IGMP Snooping or IGMP Proxy under the LAN/Advanced settings
  2. Reboot the modem and the Smart Hub
  3. If the issue persists, try connecting the Smart Hub to a different router or switch in the network

How to perform a factory reset (Nova wall controller)​

  1. From the Nova home screen, tap Menu → Settings → Nova Settings
  2. Scroll to the bottom and tap Factory Reset
  3. Enter the installer password when prompted
  4. The Nova will reboot and return to the initial setup screen

How to check Aircon CPU ID and Hub ID​

  1. On the Nova, tap Menu → Settings → Nova Settings → iZone
  2. The CPU ID and Hub ID are listed under System Information
  3. Note these down before contacting support

How to check AC unit status​

  1. Tap the AC icon on the Nova home screen
  2. Tap Info or Status to view the current AC unit mode, set temperature, and fan speed reported by the C325 interface module

How to check a zone's damper status​

  1. On the Nova, tap the zone you want to inspect
  2. Tap Zone Info — the current damper position (open/closed/%) is shown
  3. If the damper shows closed when it should be open, check wiring to that zone port

How to update Nova / Nova Mini firmware​

  1. Ensure the Nova is connected to Wi-Fi (Wi-Fi icon visible)
  2. Tap Menu → Settings → Nova Settings → iZone → Nova Controller → Check for Update
  3. If an update is available, tap Update and wait for the process to complete
  4. The Nova will reboot automatically after updating

How to manually change the date and time​

  1. Tap Menu → Settings → Date & Time
  2. Disable automatic time sync if enabled
  3. Set the correct date and time manually
  4. Tap Save

Nova remote support and diagnostic log upload failure​

If the diagnostic log fails to upload during a remote support session:

  1. Ensure the Nova has a stable Wi-Fi/internet connection
  2. Try the upload again from Menu → Settings → Remote Support → Upload Log
  3. If it continues to fail, restart the Nova and retry
  4. Contact iZone support with the system's CPU ID and Hub ID if the issue persists