a/1/8 (sub-code 8/2/5) — Conflicting Controller Addresses

What does a/1/8 mean?

This locking fault occurs when both RC20 and RC35 remote controls are set as Master controllers. Both controls are trying to manage heating circuit 1 and Domestic Hot Water (DHW), leading to incorrect operation of the heating system.

• RC20 and RC35 remote controls are both configured as Master units.
• Conflicting address settings between RC20 and RC35 controllers.
• Incorrect setup of heating programs and room temperatures.

Click steps to track your progress.

1. 1

   Check the settings for both RC20 and RC35 remote controls.

2. 2

   Ensure only one remote control (RC20 or RC35) is configured as the Master for heating circuit 1 and DHW.

3. 3

   Consult the installer or manual to adjust the address settings for the remote controls.