F91 - Timer LED blinking due to low pressure or gas leakage

What does F91 mean?

The system has detected a potential gas leak or low pressure issue. The Timer LED will blink, and the unit will stop operation. This occurs if specific low-pressure conditions are met twice within 20 minutes.

• Refrigerant gas leakage
• Low refrigerant levels
• Issues with pressure sensors

Click steps to track your progress.

1. 1

   Immediately turn off the air conditioner.

2. 2

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

3. 3

   Do not attempt to operate the unit until it has been inspected by a professional.

4. 4

   Contact a qualified technician to check the refrigerant system.