Alarm Z1 Evap. Pressure on JR0 too low — Repeated evaporation pressure warning

What does 5515 mean?

This alarm triggers if three warnings (code 5514) are registered within three hours, or if the warning is continuously active for 30 minutes. It indicates a persistent problem with the evaporation pressure being too low.

• Blocked or low air flow through the air heat exchanger of the Heat Pump.
• Defective fan or issues with its power/control.
• One of the expansion valves is stuck in its closed position.
• Defective I/O module.

Click steps to track your progress.

1. 1

   Ensure sufficient air flow through the air heat exchanger, clearing any potential blockages.

2. 2

   If the outdoor unit fan is not running, activate the test function for the outdoor unit.

3. 3

   If the alarm persists, contact a qualified technician to inspect the fan, expansion valves, and electrical connections.