F3 - 1 red flash, 2 green flashes — 63L open

What does F3 mean?

This error relates to the low-pressure switch (63L) being open. This means the switch is not detecting the expected low-pressure condition.

• Low-pressure switch disconnected
• Contact failure in the low-pressure switch
• Low refrigerant charge
• Defective control board

Click steps to track your progress.

1. 1

   Check the low-pressure switch for secure connection.

2. 2

   Verify the switch's continuity.

3. 3

   Inspect the refrigerant levels (requires professional).

4. 4

   Consider a possible defective board if other checks are clear.