EVCO AL Error Code

What does EVCO AL mean?

The AL alarm on Evco EV3-series and EVK-series controllers indicates that the cabinet or room temperature has dropped below the low-temperature alarm threshold. The controller compares the measured temperature against parameter A1 (low alarm differential below setpoint) and activates the AL alert when the reading stays below the limit for the configured delay. Regulation continues normally; the alarm is purely a notification and resets automatically once temperature recovers.

Symptoms

• AL displayed on the controller screen, typically flashing.
• Alarm buzzer activates if connected to the alarm relay output.
• Cabinet temperature reading is at or below the low alarm threshold.
• Compressor continues to run normally — regulation is not interrupted.
• Alarm clears without user action once the temperature rises above the threshold.

Common causes

• Parameter A1 (low alarm differential) is set too narrow, triggering false alarms during normal pull-down.
• Door gasket failure or door left open allowing excessive cold air loss.
• Defrost heater over-running and causing a rapid temperature swing below setpoint.
• Cabinet overloaded with warm product that then pulls temperature down past setpoint during recovery.
• Evaporator airflow restricted by ice buildup, causing erratic temperature readings.

Ask the AskWhiz AI about EVCO AL

AskWhiz

online

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

What causes EVCO AL?Step-by-step fix for EVCO AL?Is EVCO AL safe to ignore?

MessageHelp me troubleshoot EVCO AL

Diagnostic steps

1. Read the current temperature and compare to setpoint

   Check the displayed temperature against the setpoint. A reading more than A1 degrees below setpoint confirms the trigger condition.

2. Inspect the cabinet for open doors and gasket integrity

   Close any open doors, then run your hand along the door seal while the door is closed to detect cold air leaks. Replace damaged gaskets promptly.

3. Review and adjust parameter A1

   Enter the configuration menu and check the A1 value. Increase A1 if the alarm is triggering during normal defrost recovery or pull-down cycles. Also verify the alarm delay parameter is appropriate for the application.

4. Inspect the evaporator for ice buildup

   If the evaporator is frosted over, initiate a manual defrost cycle. After defrost, monitor temperature to confirm it stabilizes within the expected range.

5. Confirm alarm self-resets after temperature recovery

   Once the temperature returns above the low alarm threshold, the AL code should clear automatically. If it does not clear, cycle power and verify probe integrity using the Pr1 troubleshooting steps.

When to call a professional

Contact a licensed refrigeration technician if the cabinet temperature drops below the alarm threshold repeatedly without an obvious cause such as an open door, if the evaporator is frequently icing up indicating a defrost system fault, or if adjusting parameter A1 to a wider differential does not stop recurrent false alarms — these patterns suggest a system refrigerant charge or controls issue requiring pressure gauge diagnostics.