Coreco Pb7 Error Code
Carel KDT-Touch controller — On an RTX-RTN-RTD600 (/V) family power board, the E7 keypad-communicat
Source: Coreco_kdt-touch_instruction-sheet_9is24304-1_en_rel0613_termostatos.pdf
What does Coreco Pb7 mean?
On the Coreco controller (Carel KDT-Touch), Pb7 is on an RTX-RTN-RTD600 (/V) family power board, the E7 keypad-communication error may instead be reported as a Pb7 error.
Symptoms
- Display shows Pb7
- 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
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Diagnostic steps
Check the keypad-to-board connection
Pb7 is a keypad↔power-board communication error; check the connecting cable/connector. It clears once communication is restored.
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
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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