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E7Coreco

Coreco E7

Carel KDT-Touch controller — Keypad-to-power-board communication error

Source: Coreco_kdt-touch_instruction-sheet_9is24304-1_en_rel0613_termostatos.pdf

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What does Coreco E7 mean?

On the Coreco controller (Carel KDT-Touch), E7 is keypad-to-power-board communication error: no communication between the keypad and the power board for 60 seconds or longer puts the KDT keypad into error mode E7; the keypad stays completely inactive except for the display showing the label E7, and clears once communication is restored.

Symptoms

  • Display shows E7
  • Keypad inactive except for the display
  • No response to key presses

Common causes

  • No communication between the keypad and the power board (>=60 s)
  • Cable/connector fault between keypad and board
  • Power-board fault

Diagnostic steps

  1. 01

    Check the keypad-to-board connection

    E7 is a keypad↔power-board communication error; check the connecting cable/connector. It clears once communication is restored.

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When to call a professional

If reseating the connection does not clear it, have a qualified technician check the keypad/power board.

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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)

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