26
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
Open Door
(dA) alternating with cold
room temperature
Door opening time exceeds
max opening time set by
parameter
Automatic reset when the
door is closed.
High pressure
(PrE) alternating with room
temperature; LED (4) lights
up each time the high
pressure switch is tripped.
If more than 10 trips occur
in one hour, then (PAL)
alternating with cold room
temperature is displayed
and alarm relay is activated
together with LED (4).
In this situation all
functions are interrupted.
Faulty operation of
condenser fan.
Dirty condenser.
Switch off the refrigerating
unit, wait a few seconds
and switch on again.
Voltage monitor
(bAL) alternating with cold
room temperature. The
voltage monitor is an
electronic device which
checks the supply voltage
of the unit when voltage
variations /-12%.
The unit stops for about 6
minutes and restarts
automatically if voltage is
within the prescribed limits.
Warning: on first starting
the monitor carries out a
counting phase of 7
minutes, during which the
unit should be left
connected but in OFF
condition.
Wrong supply voltage
