Troubleshooting - Zanotti ZN Serie Manual De Uso

12.3 Troubleshooting

During operation following troubles may occur:
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:
2
ATTENTI ON
Do not use either hot w ater or any pointed, cutting, m etal objects to rem ove ice blocks.
Unsatisfactory efficiency of the unit:
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.
W ARN I NG:
Rem oval of protections during m achine operation is absolutely forbidden. They have been
developed to safeguard the operator's safety.
- insufficient ventilation of the room where the unit is installed;
- anomaly in mains voltage;
- faulty operation of condenser fan.
Device reset is automatic.
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
29