Ako EE

What does Ako EE mean?

EE indicates an internal memory (EEPROM) error in the controller. The controller has failed to read or write its non-volatile configuration memory correctly. This fault means the controller cannot reliably access or store operating parameters, which makes normal regulation unsafe. The controller should be treated as failed until the fault is cleared or the unit replaced.

Symptoms

• EE appears on the display, typically at power-up or shortly after.
• Controller parameters reset to defaults or show unexpected values.
• Controller may not regulate temperature, operate relays, or behave predictably.
• Alarm relay activates.
• Fault persists through power cycling in hardware EEPROM failure cases.

Common causes

• Voltage spike or power surge corrupting EEPROM memory contents (most common).
• Gradual EEPROM wear-out causing a failed memory cell.
• Failed firmware update leaving the EEPROM in a corrupted state.
• Electrical noise from poorly filtered power supply affecting the controller board.
• Internal component failure on the controller PCB.

Diagnostic steps

1. 01

   Cycle power to the controller

   Remove power from the controller for at least 30 seconds to fully discharge circuits, then restore power. A transient memory read error will clear on restart; if EE does not reappear, monitor for recurrence.

2. 02

   Check supply voltage quality

   Measure supply voltage at the controller terminals. Voltage outside the rated range (typically 230 V ±10% or 12/24 V depending on model) or high electrical noise can cause EEPROM corruption. Fit a suppressor or stabilizer if needed.

3. 03

   Verify and re-enter all parameters

   If EE clears after power cycling, enter the parameter menu and verify all settings against commissioning records. A memory error may have reset values to factory defaults.

4. 04

   Attempt factory reset if parameters are corrupted

   If parameters are garbled, perform a factory reset per the AKO controller manual and re-program all parameters from your commissioning record before returning the unit to service.

5. 05

   Replace the controller if EE persists

   If EE returns within 24 hours or is present continuously, the EEPROM has a failed memory cell. The controller board must be replaced; field repair of EEPROM is not practical for this controller.

When to call a professional

A licensed technician should handle EE faults that persist after power cycling, as the controller is unreliable and the refrigeration system may be running without proper temperature control. Controller replacement and full parameter re-commissioning require someone familiar with the system's design setpoints, alarm thresholds, and defrost schedule to restore safe operation.