Technoblock SVN0050 - Troubleshooting; Alarms

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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:
- 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.
ATTENTION
Do not use either hot water or any pointed, cutting, metal objects to remove ice blocks.
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.
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.
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 DISPLAY CAUSE REMEDY
High temperature
(HA) alternating with cold room
temperature.
Excessive door openings.
Too high temperature of
products stored.
Malfunction of the unit.
Low temperature
(LA) alternating with cold room
temperature.
Malfunction of electronic
controller
Service intervention
Room sensor
Steady (P1). Sensor not connected Replace sensor
Evaporator sensor
(P2) alternating with cold room temperature Sensor not connected Replace sensor