Alarms; Problem Resolution - Zanotti AS Rotary Série Notice De Mode D'emploi Et D'entretien

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

Label
E1
E2
AH1
AL1
OPd
nPA
Probe alarms "E1" and "E2" start some seconds after the fault in the related probe; they automatically stop some
seconds after the probe restarts normal operation. Check connections before replacing the probe.
Temperature alarms "AH1" and "AL1" automatically stop as soon as the thermostat temperature returns to normal
values and when defrost starts.
WARNING
When the high pressure switch cuts off, the unit stops and the alarm led switches on.
The alarm reset is automatic. If the pressure switch cuts off 10 times during 1 hour, it
will be necessary to switch off and then switch the unit on again.
Failure
Environment probe
(Pb1)
End of de-frosting
probe
(Pb2)
Alarm of HIGH
ambient
temperature
Alarm of LOW
ambient
temperature
Alarm door open
High pressure
Cause
• values outside the
operation range
• failed / shortcircuited /
open probe
• values outside the
operation range
• failed / shortcircuited /
open probe
•exceeding of the preset
temperature (over the
maximum preset
differential)
exceeding of the preset
temperature (over the
minimum preset
differential)
• door open
Each time the pressure
switch trips, the buzzer
and the red led are
activated. If more than 10
trips occur in 1 hour, then
the unit is turned off
automatically.

Problem resolution

• check the type of probe
(NTC)
• check the wiring of probes
• replace the probe
• check the type of probe
(NTC)
• check the wiring of probes
• replace the probe
• check the compressor
operation.
•
check of cell (open doors),
its seal, introduction of hot
product etc.
• check the operation of the
control unit.
• Faulty operation of
condenser fan.
• Dirty condenser
27