Eliwell HA1

What does Eliwell HA1 mean?

HA1 is the high temperature alarm on probe Pb1 in Eliwell controllers. It activates when the cabinet or room temperature measured by Pb1 rises above the configured high-limit threshold (HAL parameter). The alarm is logged and the relay may activate, but refrigeration regulation continues — the controller does not block the compressor in response to HA1.

Symptoms

• Display alternates between 'HA1' and the current measured temperature.
• Alarm event is recorded in the controller's alarm log (AL folder).
• Alarm relay activates if configured.
• Buzzer sounds if fitted and enabled.
• Normal refrigeration regulation continues without interruption.

Common causes

• Cabinet temperature has risen above the configured high-limit alarm threshold (HAL parameter).
• Refrigeration system performance reduced due to dirty condenser coils or low refrigerant charge.
• Door left open or door seal defective, allowing warm air infiltration.
• High ambient temperature exceeding unit design limits.
• HAL parameter set too close to operating setpoint, causing nuisance alarms.

Diagnostic steps

1. 01

   Verify the actual cabinet temperature

   Compare the controller reading with an independent calibrated thermometer to confirm the temperature is genuinely elevated.

2. 02

   Check the HAL alarm threshold parameter

   Enter the programming menu and confirm HAL (or HA1) is set to an appropriate value for the application. Adjust if it is set too close to the operating setpoint.

3. 03

   Inspect condenser coils and airflow

   Clean the condenser coils of dust and debris. Verify that airflow across the condenser is unobstructed and that the condenser fan is running at the correct speed.

4. 04

   Check door seals and closing mechanism

   Inspect door gaskets for damage or gaps. Confirm the door closes fully and the latch engages properly to prevent warm-air infiltration.

5. 05

   Monitor recovery and clear the alarm

   After addressing the root cause, press any key to acknowledge the alarm. Observe the temperature trend to confirm the cabinet is recovering toward setpoint.

When to call a professional

If the cabinet temperature does not recover toward setpoint after cleaning the condenser and verifying door seals, a licensed refrigeration engineer should check refrigerant charge, measure subcooling and superheat, and test compressor efficiency. Sustained high temperatures in food-storage applications are a HACCP critical control point requiring documented corrective action.