Coreco HI Error Code
High-temperature alarm — measured temperature above set point by more than parameter AH
Source: Coreco_easy_compact_eng_termostatos.pdf
What does Coreco HI mean?
On the Coreco controller (Carel easy / easy compact), HI is the high-temperature alarm: the probe has measured a temperature higher than the set point by an amount that exceeds parameter AH. HI flashes on the display alternating with the temperature and the buzzer sounds when fitted and enabled. The alarm has automatic reset and clears once the temperature returns within the limits set by AH.
Symptoms
- Display shows HI flashing alternating with the temperature
- Buzzer sounds when fitted and enabled
- Cabinet temperature higher than the intended set point
- Risk to product if the high temperature is sustained
- Alarm clears automatically once the temperature recovers
Common causes
- Temperature has risen above the set point by more than parameter AH
- Frequent or prolonged door openings raising cabinet temperature
- Dirty condenser or restricted airflow reducing cooling
- Recent defrost or heavy product load (within the alarm-bypass time)
- High-temperature threshold (AH), differential (A0) or delay (Ad) set too tight
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Diagnostic steps
Confirm the high-temperature condition
HI means the probe read a temperature higher than the set point by more than parameter AH. Note the displayed temperature to confirm how far the cabinet is above set point.
Mute the buzzer
Press SET to silence the buzzer; HI clears automatically once the temperature returns within limits.
Check the alarm parameters
Review parameters AH (high-temperature threshold), Ad (alarm delay) and A0 (alarm/fan differential) to confirm the thresholds are appropriate, and remember the alarm is bypassed for a time after defrost (d8) or after the door opens.
Reduce obvious heat loads
Avoid frequent or prolonged door openings and do not introduce hot product; both raise cabinet temperature and can trigger HI.
Inspect cooling performance
Check the condenser is clean and airflow is unobstructed, since a dirty condenser or restricted airflow reduces cooling and can keep the cabinet above set point.
When to call a professional
If HI persists once doors, loading and a clean condenser are ruled out, a refrigeration fault (such as low refrigerant, a failing compressor or fan) may be raising the temperature. Have a qualified refrigeration technician diagnose the system, as this work involves the sealed refrigeration and electrical circuits restricted to 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
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)
Internal clock (RTC) alarm — clock fault; reset by setting the time