Troubleshooting; Alarms - Zanotti SP O Notice De Mode D'emploi Et D'entretien

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.
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 the unit is in alarm mode, the control LED lights up, the buzzer (available if installed
by the customer) starts operating and the display shows an alarm code allowing the
immediate identification of the alarm.
ALARM
High temperature
Low temperature
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.
3. Display does not light up. Check:
- if there is power to the unit;
- if mains cable is connected properly;
- fuses inside the electric panel
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.
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.
DISPLAY
(HI) alternating with cold
room temperature.
(LO) alternating with cold
room temperature.
CAUSE
Excessive door openings.
Too high temperature of
products stored.
Malfunction of the unit.
Malfunction of electronic
controller
REMEDY
Service intervention
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