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PrrCoreco

Coreco Prr

Carel RTN400 controller — Preheat alarm

Source: Coreco_rtn400_instruction_sheet_9is24288-1_rel0413_en_termostatos.pdf

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What does Coreco Prr mean?

On the Coreco controller (Carel RTN400), Prr is preheat alarm: preheat input regulator ON; label Prr displayed, compressor icon blinking, regulation locked (compressor and fans).

Symptoms

  • Display shows Prr
  • Compressor icon blinking
  • Regulation locked (compressor and fans)

Common causes

  • Preheat input regulator active
  • Preheat condition per the application configuration

Diagnostic steps

  1. 01

    Recognise the preheat state

    Prr means the preheat input regulator is ON and regulation is locked; confirm the preheat condition per the application.

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When to call a professional

If the preheat alarm is unexpected, have a qualified technician review the application configuration.

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Other Coreco error codes

E0

Control probe (probe 1) error — signal interrupted, short-circuited or incompatible probe

E1

Evaporator / defrost probe (probe 2) error — signal interrupted, short-circuited or incompatible probe

E2

Condenser / product probe (probe 3) error — signal interrupted, short-circuited or incompatible probe

IA

Immediate or delayed alarm from the multifunction digital input (external alarm)

dOr

Open-door alarm from the door-switch digital input

LO

Low-temperature alarm — measured temperature below set point by more than parameter AL

HI

High-temperature alarm — measured temperature above set point by more than parameter AH

EE

Unit parameter reading (data) error — saved configuration data error

EF

Operating parameter reading (data) error — manual reset

Ed

Defrost ended by timeout — last defrost stopped on maximum duration, not on temperature

dF

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 →