Coreco LA

What does Coreco LA mean?

On the Coreco controller (Dixell XW30/XW60/XW70), LA is the low-temperature alarm: the cabinet temperature measured by the alarm probe has gone below the alarm limit (AND below the ALL minimum-temperature threshold), after the ALd alarm delay. Outputs are unchanged; regulation continues while the alarm is signalled.

Symptoms

• Display shows LA (alternating with temperature)
• Buzzer sounds and the alarm relay activates
• Cabinet running colder than the intended set point
• Product over-chilling / freezing risk in a non-freezer cabinet

Common causes

• Temperature fell below the low-temperature limit
• Refrigeration over-cooling (control or compressor staying on)
• Alarm threshold ALL / delay ALd set too tight
• Control probe reading lower than actual

Diagnostic steps

1. 01

   Confirm the low-temperature condition

   LA means the alarm probe read a temperature below the ALL 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

   Investigate over-cooling

   Verify the control probe reading against a thermometer and confirm the compressor is not running past the set point.

When to call a professional

If LA 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.