Warning Z1 Evap. Pressure on JR0 too low — Evaporation pressure too low

What does 5514 mean?

This warning indicates that the temperature reading from sensor JR0 is below -27°C for more than 30 seconds. This suggests issues with air flow, the fan, expansion valves, or the I/O module.

• Blocked or low air flow through the air heat exchanger of the Heat Pump.
• Defective fan or missing supply voltage/control signal to the fan.
• One of the expansion valves is stuck in its closed position.
• Defective I/O module.

Click steps to track your progress.

1. 1

   Ensure there is sufficient and unobstructed air flow through the Heat Pump's air heat exchanger.

2. 2

   Activate the test function for the outdoor unit to check if the fan is running and expansion valves are opening.

3. 3

   If the warning persists, contact a qualified technician to check fan voltages, expansion valve control cables, and the I/O module.