What are the symptoms of Coreco HPA?

Display/record shows HPA. Regulation blocked while the alarm is active. Pressure-switch input tripped

What causes Coreco HPA?

Refrigeration pressure outside limits (high or low). Dirty condenser / restricted airflow (high pressure). Low refrigerant charge or restriction (low pressure). Faulty pressure switch or wiring

How do I fix Coreco HPA?

Identify the pressure fault: HPA is a pressure-switch alarm. Investigate the refrigeration cause: Check the condenser/airflow for high-pressure trips or charge/restriction for low-pressure trips

HPACoreco

Coreco HPA

Q: What does Coreco HPA mean?

On the Coreco controller (Carel RTN400), HPA is maximum pressure switch alarm (n < PEn, Auto Reset): activation of pressure switch alarm by high pressure switch regulator; folder HPA recorded in folder ALr; regulation blocked.

Carel RTN400 controller — Maximum pressure switch alarm (n < PEn, Auto Reset)

Source: Coreco_rtn400_instruction_sheet_9is24288-1_rel0413_en_termostatos.pdf

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What does Coreco HPA mean?

On the Coreco controller (Carel RTN400), HPA is maximum pressure switch alarm (n < PEn, Auto Reset): activation of pressure switch alarm by high pressure switch regulator; folder HPA recorded in folder ALr; regulation blocked.

Symptoms

Display/record shows HPA
Regulation blocked while the alarm is active
Pressure-switch input tripped

Common causes

Refrigeration pressure outside limits (high or low)
Dirty condenser / restricted airflow (high pressure)
Low refrigerant charge or restriction (low pressure)
Faulty pressure switch or wiring

Diagnostic steps

01
Identify the pressure fault
HPA is a pressure-switch alarm. Determine whether it is high or low pressure and whether reset is automatic or manual.
02
Investigate the refrigeration cause
Check the condenser/airflow for high-pressure trips or charge/restriction for low-pressure trips.

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When to call a professional

Pressure faults involve the sealed refrigeration system and must be diagnosed by a qualified refrigeration technician.

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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)

dOr

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)

CHt

Dirty-condenser warning/alarm — pre-alarm (cht) between Ac-AE and Ac, then alarm (CHt) when Ac is exceeded and refrigeration stops (manual reset)

View all Coreco error codes →