Troubleshooting; Alarms - Zanotti AS Serie Manual De Uso

12.3 Troubleshooting

During operation following troubles may occur:
ATTENTION
Do not use either hot water or any pointed, cutting, metal objects to remove ice blocks.
3. Display does not light up. Check:
4. Unit does not start operating when pressing ON/OFF key (the display is turned on): check
microdoor connection keeping in mind that the switch contact must be closed when the door
is closed.
Unsatisfactory efficiency of the unit:
WARNING:
Removal of protections during machine operation is absolutely forbidden. They have been
developed to safeguard the operator's safety.

12.4 Alarms

When an alarm condition occurs the following warning devices are activated (depending on the
nature of the alarm):
The buzzer and the alarm relay can be muted by pressing any key. When a key is pressed, the
led flashes as long as the alarm condition is present. To have the alarm code displayed, press
1. Compressor stops. The unit is equipped with an overtemperature device which stops the
compressor every time the max. allowable temperature of motor windings is exceeded.
Possible causes are:
- insufficient ventilation of the room where the unit is installed;
- anomaly in mains voltage;
- faulty operation of condenser fan.
Device reset is automatic.
2. Ice forms on the evaporator preventing air from flowing regularly.
Possible causes are:
- the door is opened too frequently;
- faulty operation of evaporator fan;
- faulty solenoid valve (in models with hot gas defrost);
- faulty defrost heater (in models with electric defrost);
- faulty defrost process. In this case some measures can be taken:
increase defrost termination temperature by some degrees, increase number of
defrosts.
- if there is power to the unit;
- if mains cable is connected properly;
- fuses inside the electric panel
If no defects are found in the unit check that: cold room doors are perfectly tight; there is
no cold dispersion; the cold room is used wisely; no unfrozen liquids or foodstuffs are
placed in the low temperature room; the evaporator is ice-free.
We recommend installation of the machines far from the doors especially when the cold
room is expected to be opened many times a day.
alarm led
buzzer
alarm relay.
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