Error 99 - Extension module 2 fault

What does 99 mean?

The user interface displays '99: Extension module 2', indicating an issue with extension module 2, an add-on component to the heat pump system. This error typically triggers an automatic reset.

• Faulty extension module.
• Loose connections to the module.
• Incorrect configuration or software issue of the module.

Click steps to track your progress.

1. 1

   Turn off the main power supply to the heat pump for 30 seconds, then turn it back on.

2. 2

   Check the wiring connections to Extension Module 2 for security.

3. 3

   Allow time for the automatic reset to occur (default 6 hours) or use the manual reset function (Line 6711) if available.

4. 4

   Contact a qualified service technician to inspect or replace the extension module.