Warning Z1 Low superheat of refrigerant — Suction gas <2°C and discharge gas <20°C

What does 5366 mean?

This warning indicates that the suction gas superheat is below 2 degrees Celsius and the discharge gas superheat is below 20 degrees Celsius. This can point to issues with the electronic expansion valve or its motor.

• Motor not correctly mounted on the electronic expansion valve.
• Defective expansion valve motor.
• Expansion valve VR1 opens too much or is stuck in an open position.

Click steps to track your progress.

1. 1

   Check that the motor is correctly mounted on the electronic expansion valve.

2. 2

   Activate the test function for the outdoor unit to observe if the electronic expansion valves open and close correctly.

3. 3

   If the warning persists, contact a qualified technician to measure the resistance of the expansion valve motor and inspect valve operation.