F91 — Low pressure prevention (Gas Leakage Detection)

What does F91 mean?

This error indicates a potential gas leak or low pressure issue. If conditions for low pressure are met twice within 20 minutes, the unit stops operation, the Timer LED blinks, and F91 is shown.

• Refrigerant gas leak
• Low refrigerant levels
• Blockage in the refrigerant system

Click steps to track your progress.

1. 1

   Check for any visible signs of refrigerant leaks (oily residue).

2. 2

   Ensure the unit is not operating under conditions that mimic low pressure (e.g., very low ambient temperature during cooling).

3. 3

   Turn off the unit and do not operate it if a leak is suspected.

4. 4

   Contact a qualified technician to check the refrigerant levels and for leaks.