No Comms on Wall Controller/App

Follow the steps below to diagnose a communication issue between the iZone system and the AC unit.

For Nova/Nova mini users

Confirm the Nova/Nova mini controller firmware is up to date

Navigate to Menu → Settings → Nova Services.
Check the Controller Version Number and confirm that the Nova firmware/software is up to date by tapping check for update.

Hard reset the AC unit for 15 minutes

Check System details

If the unit still shows "No Comms" after completing the hard reset, check the system details on the Nova wall controller.
Navigate to Menu → Settings → System Settings.
Tap the system/ID number beginning with 000.
Tap iZone Hub / Wired Bridge.
Scroll down and locate Device List.
Record or take a photo of the Device List displayed.
Contact iZone Technical Support on 08 6556 6415 and press 3 for Technical Support.
Provide the technician with your issue and the recorded Device List information to assist with further troubleshooting.

Hard reset the AC unit for 15 minutes

Check System details

If the unit still shows "No Comms" after completing the hard reset, check the system details on the Nexus wall controller.
Navigate to Settings → Configuration → Configure Air Conditioner (x).
Enter the password WAMFUD and tap Enter.
Under the System tab, tap System Device List.
Record the information displayed or take a clear photo of the Device List.
Tap on the AC Unit tab and make sure the AC Unit Make is set to Auto Detect.
Then, use the down arrow at the top of the screen to scroll down and tap Fault History.
Check the right-hand side of the screen to see if any faults or errors have been recorded.
If any faults or errors are listed, take a clear photo of the Fault History / error list.
Contact iZone Technical Support on 08 6556 6415 and press 3 for Technical Support.
Provide the technician with the issue details, System Device List, and any Fault History / error list to assist with further troubleshooting.

Hard reset the AC unit for 15 minutes

Check AC Unit Power Supply

If the iZone system is connected to a different power source from the AC unit, check for any power supply issues on the AC unit circuit side.
Confirm that the indoor unit PCB has flashing indicator lights.
If there are no lights, investigate the AC unit's power supply and indoor board.

Test Using the AC Unit's OEM Controller

Test the AC unit using its original OEM/brand controller.
Confirm whether the AC unit operates correctly independently of the iZone system.
If the AC unit does not respond to the OEM controller, investigate the AC unit itself before continuing with iZone troubleshooting.
If the AC unit operates correctly with the OEM controller but not through iZone, focus the investigation on the iZone module, communication cable, compatibility, or configuration.

Check the AC Unit Module

Confirm that the correct iZone AC unit module is installed for the AC model (use the AC compatibility guide).
Check that the module has flashing indicator lights.
Note the colour and sequence of the flashing lights, as this may indicate the module's status or an error condition.

Check Communication Cable Connections

Make sure the cable used is a shielded two core twisted pair cable.
Inspect the communication cable at both ends.
Confirm that the cable is securely connected to:
- The iZone CPU.
- The AC unit indoor board at the correct terminals.
Check for loose, damaged, or incorrectly terminated connections.

Check Communication Cable Polarity and DIP Switches

Confirm that the communication cable polarity is correct at both ends.
Check whether the AC unit requires specific DIP switch settings on the indoor or outdoor board.
Confirm the required configuration against the iZone AC compatibility guide.
If the AC unit works fine on the OEM/brand controller and all above checks have been done, please contact iZone Technical Support on 08 6556 6415 and press 2 for Technical Support.