TB alarm — Thermal Blockage or Boiler Overheat Detected

What does TB alarm mean?

The heat pump has registered a thermal blockage or an overheat condition, which is a critical alarm. This prevents the heat pump from operating normally to protect its components from damage.

• Restricted flow in the heating system.
• Faulty temperature sensor.
• Pump malfunction.
• Excessive heat demand not met by flow.

Click steps to track your progress.

1. 1

   Access the 'ALARM LOG' (Menu 3.4) on the display to view details of the TB alarm.

2. 2

   Navigate to the 'info / action' section for the TB alarm (via the general alarm menu) for specific advice.

3. 3

   Attempt to 'reset alarm' in the display.

4. 4

   Ensure the heating system is not obstructed and all valves are fully open.

5. 5

   If the alarm persists or returns, contact your installer, providing them with the 'TB alarm' code.