Alarm Z1 Evap. Pressure on JR0 too low — Evaporator pressure failure

What does 5515 mean?

This alarm is triggered after 3 warnings (code 5514) within 3 hours, or if the warning persists for 30 minutes, specifically during cooling mode. It indicates a persistent issue with low evaporator pressure.

• Blocked or low airflow through the air heat exchanger.
• Missing fan voltage or control signal.
• Stuck expansion valve.
• Defective I/O module.

Click steps to track your progress.

1. 1

   Ensure adequate airflow through the air heat exchanger.

2. 2

   Verify the presence of 230V supply voltage and the 0-10V control signal for the fan.

3. 3

   Check the control cables and operation of the expansion valves.

4. 4

   Replace the I/O module if voltages are missing, or the fan if voltages are present but it doesn't run.