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16
Installation and Operations Manual
Description of the Main Signals
and Alarms
LED ashing
The activation of the corresponding function is delayed by a timer,
awaiting an external signal or disabled by another procedure that
is already in progress. e.g. if is a continuous cycle in progress and a
defrost is called, the latter will remain pending until the end of the
continuous cycle, and the corresponding LED (defrost) will ash.
E0 steady or ashing
Control probe error:
• probe not working: the probe signal is interrupted or short-
circuited;
• probe not compatible with the instrument;
The alarm signal E0 is steady if it is the only active alarm (the
temperature value is not displayed), while it ashes if other alarms
are active or the second probe is displayed.
E1 ashing
Evaporator probe or food conservation probe error:
• probe not working, the probe signal is interrupted or short-
circuited;
• probe not compatible with the instrument;
E2 ashing
Condenser probe or food conservation probe error:
• probe not working, the probe signal is interrupted or short-
circuited;
• probe not compatible with the instrument;
IA ashing
Immediate or delayed alarm from multifunction digital input:
• check the multifunction input and parameters A4 and A7.
LO ashing
Low temperature alarm. The probe has measured a temperature
lower than the set point by a value that exceeds parameter AL:
• check parameters AL, Ad and A0.
The alarm is automatically reset when the temperature returns
within the set limits (see parameter AL).
HI ashing
High temperature alarm. The probe has measured a temperature
higher than the set point by a value that exceeds parameter AH.
• check parameters AH, Ad and A0.
The alarm is automatically reset when the temperature returns
within the set limits (see parameter AH).
EE displayed during operation or on power-up
unit parameter reading error. See Data errors.
EF displayed during operation or on power-up
operating parameter reading error. See Data errors.
Ed ashing
The last defrost ended after exceeding the maximum duration
rather than when reaching the end defrost set point.
• check parameters dt, dP and d4;
• check the eciency of the defrost.
The message disappears when the next defrost ends correctly.
dF ashing
Defrost running:
• this is not an alarm signal, but rather a message that the
instrument is running a defrost. Only shown if d6= 0.
CHt ashing
Dirty condenser alarm:
• check parameters A4, Ac, AE and Acd.
EtC ashing
Internal clock error.
Data Error
In certain operating conditions, the instrument may detect errors in
the data saved. These errors may compromise the correct operation
of the instrument. If the microprocessor detects a data saving error,
the display shows the message “EE”.
If the fault persists, the controller needs to be replaced. If, on the
other hand, the message disappears, it can continue to be used.
When “EE” error occurs frequently and/or remains for some time,
the controller should be checked, as the original precision may not
be guaranteed.
3. Controllers