Ako HI Error Code

What does Ako HI mean?

The controller is displaying the HI status to indicate the controlled temperature has exceeded the maximum temperature alarm threshold configured in parameter A1. This is a high-temperature alarm, not a controller hardware fault. It signals that the cold room or cabinet is warmer than the permitted maximum, which risks product safety and regulatory compliance.

Symptoms

• HI appears on the display, alternating with the current temperature reading.
• Alarm relay activates, triggering any connected external alarm device.
• Audible alarm sounds on the controller.
• Temperature reading confirms the space is above the A1 setpoint plus alarm delay threshold.
• Product may be at risk if the condition persists.

Common causes

• Compressor or refrigeration system failure causing warm conditions (most common).
• Excessive door openings allowing warm ambient air into the cold room.
• Heavy product loading with insufficient pull-down time.
• Defrost cycle running longer than expected or stuck in defrost.
• A1 parameter set too low relative to the actual operating setpoint, generating nuisance alarms.

Ask the AskWhiz AI about Ako HI

AskWhiz

online

Hi — I'm the Refrigeration demo. Ask me anything in this domain.

What causes Ako HI?Step-by-step fix for Ako HI?Is Ako HI safe to ignore?

MessageHelp me troubleshoot Ako HI

Diagnostic steps

1. Check the current temperature reading

   Confirm the displayed temperature is genuinely above the A1 alarm threshold and not a sensor artifact. Verify with an independent calibrated thermometer if needed.

2. Inspect the refrigeration system operation

   Verify the compressor is running, condenser fans are operating, and no frost blockage is present on the evaporator. A compressor fault or refrigerant shortage is the most common cause of a genuine HI alarm.

3. Check door seals and door status

   Inspect cold room door gaskets for damage and confirm the door is fully closed. Repeated door openings introduce warm air that causes gradual temperature rise.

4. Review A1 and A5 parameter settings

   Enter the parameter menu and verify A1 (maximum temperature alarm setpoint) and A5 (alarm delay) are appropriate for the application. Adjust if the alarm threshold is incorrectly configured for the setpoint.

5. Reset the alarm after temperature recovers

   Once the temperature drops back below the alarm threshold and the root cause is resolved, reset the alarm manually or allow auto-reset based on controller configuration.

When to call a professional

Call a licensed refrigeration technician if the high-temperature alarm is caused by compressor failure, low refrigerant charge, or a stuck reversing valve, as these require refrigerant system expertise. A technician is also needed if the temperature has reached levels that put food safety compliance at risk and you need a documented system inspection for HACCP records.