Coreco HA

What does Coreco HA mean?

On the Coreco controller (Dixell XW30/XW60/XW70), HA is the high-temperature alarm: the cabinet temperature measured by the alarm probe has gone above the alarm limit (AND above the ALU maximum-temperature threshold), after the ALd alarm delay. Outputs are unchanged; regulation continues while the alarm is signalled.

Symptoms

• Display shows HA (alternating with temperature)
• Buzzer sounds and the alarm relay activates
• Cabinet running warmer than the intended set point
• Risk to product if the high temperature is sustained

Common causes

• Frequent or prolonged door openings
• Dirty condenser or restricted airflow reducing cooling
• Recent defrost or heavy/hot product load (within the alarm-bypass time dAo)
• Refrigeration fault (low charge, failing compressor/fan)
• Alarm threshold ALU / delay ALd set too tight

Diagnostic steps

1. 01

   Confirm the high-temperature condition

   HA means the alarm probe read a temperature above the ALU limit for longer than the ALd delay. Note the displayed temperature to confirm.

2. 02

   Review the alarm parameters

   Check ALU (max) / ALL (min), ALd (alarm delay) and ALC (absolute vs relative to set point), and remember the alarm is bypassed for dAo after power-up and after defrost.

3. 03

   Reduce heat loads and check cooling

   Avoid prolonged door openings and hot product; confirm the condenser is clean and airflow unobstructed, since a dirty condenser keeps the cabinet above set point.

When to call a professional

If HA persists once doors, loading, thresholds and (for high temp) a clean condenser are ruled out, a refrigeration fault may be responsible. Have a qualified refrigeration technician diagnose the sealed system; this work is reserved for qualified personnel.