P6 - 4 red flashes, 3 green flashes — Freezing/Overheating of indoor unit heat exchanger

What does P6 mean?

This indicates the indoor unit's heat exchanger is either freezing (in cooling mode) or overheating (in heating mode). This is typically caused by restricted airflow through the indoor coil.

• Reduced airflow through the indoor coil
• Dirty air filters
• Indoor fan motor problem
• Blockage within the indoor unit

Click steps to track your progress.

1. 1

   Clean or replace the air filters in the indoor unit.

2. 2

   Check that the indoor fan is operating at the correct speed and without obstruction.

3. 3

   Ensure there are no blockages within the indoor unit's airflow path.

4. 4

   Verify the correct refrigerant charge (requires professional).