Ako AL1 Error Code

What does Ako AL1 mean?

AL1 is the maximum temperature alarm on AKO controllers in the multi-alarm AL1–AL6 series. It triggers when the control probe temperature rises above the maximum limit set in parameter A1. AL1 is compliant with domestic and international refrigeration regulations (RSIF, EN standards) and is the primary safety alarm for detecting warm conditions that risk product safety.

Symptoms

• AL1 appears on the display alternating with the current temperature.
• Alarm relay activates and audible alarm sounds.
• Temperature reading confirms the space is above the A1 maximum alarm threshold.
• AL1 remains active until the temperature drops back below the threshold (plus hysteresis).
• HACCP log records the alarm event if the controller has HACCP monitoring enabled.

Common causes

• Refrigeration system failure causing warm conditions — compressor fault, refrigerant shortage, or condenser blockage (most common).
• Excessive door openings allowing warm ambient air into the cold room.
• Heavy product loading without adequate pull-down time.
• Defrost cycle stuck in defrost or drip-off phase for an extended period.
• A1 parameter set too close to the operating setpoint, generating nuisance alarms during normal fluctuations.

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Diagnostic steps

1. Confirm the temperature is genuinely high

   Verify the displayed temperature against an independent calibrated thermometer. Rule out Probe 1 fault (E1) before diagnosing a refrigeration system failure.

2. Inspect the refrigeration system

   Check that the compressor is running, condenser fans are operating, condenser coil is clean, and evaporator is not blocked with ice. Each of these failures can cause temperature rise above the AL1 threshold.

3. Check door status and seal condition

   Confirm the cold room door is closed and gaskets are in good condition. Repeated or prolonged door openings are a common non-mechanical cause of AL1.

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 and product being stored.

5. Reset the alarm after temperature recovers

   Once the temperature drops below the A1 threshold and the root cause is resolved, reset the alarm. Document the event for HACCP records if required by your food safety protocol.

When to call a professional

Call a licensed refrigeration technician if AL1 is caused by compressor failure, low refrigerant charge, or condenser fan motor failure — all of which require qualified diagnosis and repair. A technician is also needed to provide a signed inspection record for HACCP compliance if product has been held above safe temperatures for a reportable duration.