DEFROST (green) LED continuous light - Defrosting in progress

What does DEFROST LED solid mean?

The green DEFROST LED on the base board (AA2) is continuously lit. This indicates that the Heat Pump is currently undergoing a defrosting cycle to remove ice from the outdoor unit's evaporator.

• Normal defrosting operation in cold or humid conditions.

Click steps to track your progress.

1. 1

   This is a normal operational state; no action is usually required.

2. 2

   Ensure that the outdoor unit is clear of heavy ice buildup that the defrost cycle might struggle to clear.

3. 3

   If the defrosting seems excessively long or frequent, check for conditions like poor airflow around the outdoor unit.

4. 4

   Monitor the Heat Pump's performance; if heating is affected or the light remains on constantly, consult the manual or NIBE support.