Coreco P3 Error Code
Dixell XW controller — third (configurable/display) probe failure
Source: Coreco_1592027610-xw60lt-xw60lrt-gb-r10-13022012_termostatos.pdf
What does Coreco P3 mean?
On the Coreco controller (Dixell XW30/XW60/XW70), P3 is the third (configurable/display) probe failure alarm: the probe signal is interrupted, short-circuited or out of range so the controller can no longer read it. Outputs are unchanged; the reading that used probe 3 is unavailable.
Symptoms
- Display shows P3
- Third (configurable/display) probe reading unavailable
- Alarm/buzzer active and the alarm relay may energise
- Outputs are unchanged; the reading that used probe 3 is unavailable.
Common causes
- Probe signal interrupted (open circuit / broken wire)
- Probe short-circuited
- Probe out of range or wrong (non-NTC/incompatible) type
- Loose or corroded probe terminal
- Faulty probe element
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Diagnostic steps
Confirm which probe failed
The P-code identifies the failed probe (P1 thermostat, P2 evaporator, P3 configurable/display, P4 fourth probe). Note which one before testing.
Inspect the probe wiring and connector
With power isolated, check the affected probe's signal lead and terminal for an interrupted (open) or short-circuited connection and reseat any loose or corroded connector.
Verify the probe type
Confirm the fitted probe is the correct NTC type for the Dixell XW controller; an incompatible or out-of-range probe also raises the P-alarm.
Replace the probe if faulty
If the wiring is sound and the probe is the right type, replace it. The alarm clears automatically once the controller reads the probe correctly.
When to call a professional
Access to the cabinet's electrical parts is reserved for qualified personnel. If checking the wiring and connector does not clear the probe alarm, or the probe must be replaced and regulation re-verified, have a qualified refrigeration technician complete the work.
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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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