The iZone and Other feature allows an iZone controller and the OEM controller of the AC unit to be connected to the AC indoor unit at the same time, on selected compatible AC makes only. On affected firmware versions, this feature is enabled by default and can cause incorrect control commands to be sent to the AC system.

Affected firmware: CPU Module (C225) firmware versions v3.77 and v3.80.

Known symptoms:

• AC mode changes to VENT unexpectedly or periodically.
• Zone setpoint changes unexpectedly from the selected value to an out-of-range value.
• A setpoint of 10°C has been recorded during affected cases.

Resolution: Change the iZone and Other settings to iZone Only. This can be done on site:

Nova and Nova Mini:

• Log in using your installer code on the Nova screen.
• Tap Menu → Settings → System Settings (ID number) → AC Settings → Advanced Settings → scroll to the bottom of the menu → change all 4 "iZone and Other" options to "iZone Only".

Nexus and Nano:

• Tap Settings / Configuration → insert system password wamfud and enter → tap AC Unit Setup → locate the Master / Slave option in the menu → disable "Other" for all 4 options and leave the four "iZone" options selected.

Issue is fixed on v3.83 onwards: the iZone and Other feature is no longer enabled by default.

If you are experiencing these symptoms, please contact the iZone Support Team at supportdesk@izone.com.au. Our support team can assist with checking the system configuration and applying the required settings.

White Nexus screens from production batches manufactured in late 2024 and early 2025 may fail over time. Root cause confirmed by the manufacturer as a non-dust-free manufacturing environment. Silver Nexus screens are not affected.

Symptom progression: Screen begins fading to white, then progresses to a fully white, unusable display. This progression has been consistently observed in the field.

Known affected batch numbers:

• RC060524
• RC060824
• RC191225
• RC211025

Resolution: Issue resolved by mid-2025. Additional QC steps were introduced and the heat QA run-in test was extended by three weeks for all manufactured screens. No recurrence has been seen in later batches. Overall failure rate has been approximately 5%.