Zanotti zer0 - Alarm history; List of alarms and messages

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5.3.3 List of alarms and messages
The following is the complete list of all the signals and alarms that may occur; also we outlined some of the
possible causes and remedies can be implemented also by the user, remembering that if the problem persists you
should contact an authorized service center.
Icon Alarm Description Possible causes Possible remedies
PrL
PMI
Low pressure
Following the intervention of the
low pressure switch , the display
shows the led alarm and
PRl(PrL).
When the correct pressure value
is restored, the unit restarts
automatically.
In case of a frequent number of
interventions in a given period, it
is displayed the alarm
PMI(PMI), which stops the unit
completely.
- Refrigerant leakage
- Evaporator packaged of
ice
- Failure of evaporator
fans
- Outside temperature
very low (<0°C)
- Perform a manual
defrost and ensure
that the evaporating
remains clean and
free of obstructions
- Confirm the correct
operation of the
evaporator fans
PrH
PMS
High pressure
Following the intervention of the
high pressure switch , the display
shows the led alarm and
PRh(Prh).
When the correct pressure value
is restored, the unit restarts
automatically.
In case of a frequent number of
interventions in a given period, it
is displayed the alarm
PMS(PMS), which stops the unit
completely.
- Failure of condenser fans
- Dirty condenser of
insufficient air flow
- Moisture in the circuit
- Clean the condenser
- Check the condenser
fan
- Check if there are no
obstacles in front of
the condenser such
as to obstruct the
proper air flow
F1t
FtB
Electric motor
protection
(only for stand-
by mode units)
Following the intervention of the
electric motor protecion, the
display shows the led alarm
and F1t(F1t).
When the correct pressure value
is restored, the unit restarts
automatically.
In case of a frequent number of
interventions in a given period, it
is displayed the alarm ftb(Ftb),
which stops the unit completely.
- Stand-by motor defective
- Low supply voltage
- Power source too far
from the unit
- Adjusting CPR (KVL) not
correct
- Check is the voltage
is correct
- Check if there are
short circuit in the
stand-by motor
- Check the setting of
the thermal relay
E01
Probe failure
The display show E01(E01) the
led alarm
- Temperature probe
defective or not properly
connected
- Check the probe
connection
PAb
Ab
Battery tension
The label PAb(PAb) indicates a
decrease in the supply voltage. If
the drop is too high, the display
shows Ab(Ab) and the unit stops.
When the correct voltage is
restored, the unit restarts
automatically.
- The alternatori s not
charging
- Battery not in good
conditions
- Excessive electric
absorption
- Check the battery
charge
- Check the efficency
of the vehicle’s
electrical system
- Check the connection
of the locked up wire
ALM
Double power
supply
(only for stand-
by mode units)
This alarmi is generated when
there are simultaneously the
power supply from network and
from vehicle battery.
This alarm stops the unit, the
display shows ALM(ALM) and
the incons and flash
simultaneously.
- The ignition key is
turned on when the plug
is still connected
- The plug is connected
when the vehicle is still
on