Alarms - Zanotti DBO Serie Mode D'emploi

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
Room sensor
Evaporator sensor
Open Door
High pressure
Voltage monitor
DISPLAY
(HA) alternating with cold
room temperature.
(LA) alternating with cold
room temperature.
Steady (P1).
(P2) alternating with cold
room temperature
(dA) alternating with cold
room temperature
(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.
(bAL) alternating with cold
room temperature. The
voltage monitor is an
electronic device which
checks the supply voltage
of the unit when voltage
variations exceed +/-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.
CAUSE
Excessive door openings.
Too high temperature of
products stored.
Malfunction of the unit.
Malfunction of electronic
controller
Sensor not connected
Sensor not connected
Door opening time exceeds
max opening time set by
parameter
Faulty operation of
condenser fan.
Dirty condenser.
Wrong supply voltage
REMEDY
Service intervention
Replace sensor
Replace sensor
Automatic reset when the
door is closed.
Switch off the refrigerating
unit, wait a few seconds
and switch on again.
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