Additional heat blocked symbol displayed — Additional heat is not available

What does Additional heat blocked symbol mean?

The display shows a symbol indicating that the supplementary or 'additional' heat function is currently blocked. This means the electric immersion heater or other auxiliary heat source is not active, potentially due to system settings, a schedule, or an alarm.

• The operating mode selected in menu 4.2 does not allow for additional heat.
• Additional heat blocking is scheduled in menu 4.9.5.
• An active alarm is present, causing the additional heat to be blocked.
• External tariff control is active, blocking electrical output.

Click steps to track your progress.

1. 1

   Check the operating mode in menu 4.2 and ensure it is set to allow additional heat if required.

2. 2

   Review any scheduled blocking of additional heat in menu 4.9.5 and adjust as necessary.

3. 3

   If an alarm is active on the display, resolve it first, as it may be preventing the use of additional heat.

4. 4

   Confirm that external tariff blocking (if installed and configured) is not currently active, as this disconnects additional heat.