Coreco HA Error Code
Dixell XW controller — high-temperature alarm
Source: Coreco_1592027610-xw60lt-xw60lrt-gb-r10-13022012_termostatos.pdf
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
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Diagnostic steps
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.
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.
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.
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Other Coreco Error Codes
Control probe (probe 1) error — signal interrupted, short-circuited or incompatible probe
Evaporator / defrost probe (probe 2) error — signal interrupted, short-circuited or incompatible probe
Condenser / product probe (probe 3) error — signal interrupted, short-circuited or incompatible probe
Immediate or delayed alarm from the multifunction digital input (external alarm)
Open-door alarm from the door-switch digital input
Low-temperature alarm — measured temperature below set point by more than parameter AL
High-temperature alarm — measured temperature above set point by more than parameter AH
Unit parameter reading (data) error — saved configuration data error
Operating parameter reading (data) error — manual reset
Defrost ended by timeout — last defrost stopped on maximum duration, not on temperature
Defrost running — status message shown during a defrost cycle (not an alarm)
Dirty-condenser warning/alarm — pre-alarm (cht) between Ac-AE and Ac, then alarm (CHt) when Ac is exceeded and refrigeration stops (manual reset)
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