Ako E25 Error Code

What does Ako E25 mean?

E25 is the second-evaporator equivalent of E15. It signals that persistent system instability has forced the controller to deactivate SELFDRIVE mode for the second evaporator. Unlike E24 (temporary calibration failure), E25 represents a complete SELFDRIVE shutdown for the second evaporator circuit. The controller returns to standard regulation. To re-enable SELFDRIVE for the second evaporator, the controller must be restarted.

Symptoms

• E25 appears on the display.
• SELFDRIVE mode is deactivated for the second evaporator circuit.
• Controller reverts to standard temperature regulation for the second evaporator.
• Alarm relay activates.
• E25 persists until the controller is restarted and SELFDRIVE re-enabled.

Common causes

• Repeated SELFDRIVE calibration failures (E24) driving the controller into a permanent fallback state.
• Sustained refrigerant instability on the second evaporator circuit (hunting expansion valve, floodback).
• Persistent excessive door openings preventing any stable calibration window.
• Probe S3 consistently reading unstable temperatures due to poor positioning.
• Refrigerant shortage causing the second evaporator circuit to be chronically unstable.

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Diagnostic steps

1. Investigate and resolve the underlying instability cause

   Before restarting the controller, identify and fix the root cause of the instability — whether it is probe positioning, expansion valve hunting, door management, or refrigerant charge. Restarting without fixing the root cause will trigger E25 again.

2. Verify probe S3 position

   Confirm S3 is securely clipped to the second evaporator coil, away from high-airflow zones. Reposition if needed.

3. Check the second evaporator expansion valve

   Monitor suction superheat on the second evaporator circuit. Hunting or unstable expansion valve operation directly causes the calibration instability that leads to E25.

4. Restart the controller to re-enable SELFDRIVE

   Power cycle the controller to clear E25 and re-enter SELFDRIVE mode for the second evaporator. Verify the controller enters calibration successfully after restart.

5. Monitor for recurrence

   After restarting, observe whether SELFDRIVE completes calibration without triggering E24 or E25 again. If E25 returns promptly, the refrigerant system fault has not been resolved.

When to call a professional

Call a licensed refrigeration technician before restarting the controller if E25 recurred multiple times, as repeated SELFDRIVE deactivation points to a refrigerant circuit problem requiring pressure measurements, expansion valve adjustment, or refrigerant charge correction — all tasks that require certified refrigerant handling.