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5. Alarms, signalling and troubleshooting
In the following table you can find the most frequent causes for any operation anomaly and some suggested
explanations and /or solutions to it.
Display
Cause
Flashing LED
Actuator set delay
Temperature
Door switch broken or
flashing
door open
Temperature
Door open for a period of time
flashing and
longer than d8 parameter
buzzer ON
Flashing E0
Control probe error
Flashing E1
Evaporator probe error
Flashing IA
Alarm from digital input
Flashing dA
Delayed alarm from digital input
Flashing LO
Low temperature alarm (temp.
lower than SET - AL - A0)
Flashing HI
High temperature alarm (temp
higher than SET + AH + A0)
EA, EB, EE
Data acquisition error. RESET
procedure
(for mod. MTCA* see point
3 of the Warning chapter 4.5)
Flashing Ed
Defrost end by timeout
Flashing dF
Defrosting in progress
Check
Insertion of the relative function is delayed for a
period while awaiting an external signal or while
held up by another process still in progress.
Close the door or check the door switch.
Check the door status and the value of the parameter d8
Probe not compatible with the equipment; probe
cable interrupted or short circuit. Faulty sensor:
disconnect the probe from the instrument and
measure the resistance (NTC: 0°C=27KΩ).
Probe not compatible with the equipment; probe
cable interrupted or short circuit. Faulty sensor:
disconnect the probe from the instrument and
measure the resistance (NTC: 0°C=27KΩ).
Check Multi-function inputs and parameters A4 and A5.
Check Multi-function inputs and parameters
A4, A5 and A7.
Check param.s AL, Ad and A0. The alarm will cease
as soon as the temp. returns within the limits selected.
Check param.s AH, Ad and A0. The alarm will cease
as soon as the temp. returns within the limits selected.
In order to restore normal working conditions, reset
the default value of the param.s, using this procedure:
• turn off the control;
• pressing the
button and, keeping it
prg
pressed, turn on the controller;
• the display shows "-c-"; release the PRG button;
• after a few seconds, the instrument enters the RESET
procedure and allows the modification of parameters;
• should EE persist, press the
the message disappears. If the error persists, it
is necessary to replace the instrument.
Any modification made before the reset
procedure will be lost
• Check parameters dt, dP and d4.
• Check if the defrost was done.
• if neces. inhibit the Ed alarm through the r3 par.
This is not an alarm signal, but it indic. that the instr.
is carrying out a defrost. Appears only if par. d6=0.
33
button until the
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