Error 443 — Operation prohibited due to pressure drop

What does 443 mean?

The system's operation is prohibited because a significant pressure drop has been detected. This indicates a potential issue within the refrigerant circuit.

• Blockage in the refrigerant lines
• Low refrigerant charge
• Faulty pressure sensor readings
• Internal system restriction

Click steps to track your progress.

1. 1

   Check system pressures (high and low side).

2. 2

   Inspect refrigerant lines for any signs of blockage or damage.

3. 3

   Ensure the refrigerant charge is correct.

4. 4

   A technician should investigate the cause of the pressure drop.