ems100
Product Manual, Issue 4
www.nexo.com
Page 37
4.
TROUBLESHOOTING
The ems100 Nexo controllers can be set to sound a buzzer with alarm conditions. The following table
shows examples of alarms that could be displayed on an ems100 Nexo controller.
Problem or Alarm
Meaning
Action
Door open
Refer to Door open alarms
Refrigeration
system failure
Refer to Refrigeration system failure (rSF) alarms
Condenser high
temperature
Refer to Condenser high temperature (Ht) alarms
Sensor failures
Appliance sensor (PF1): PF1 Refer to Appliance sensor failure.
Condenser sensor (PF2): Display alternates between PF2 and
the appliance sensor temperature. Refer to Temperature sensor
alarms
Cooler not cooling
Refer to Not cooling problems
Cooler lights do not
switch on
If the controller is in the Ready mode, check the lights switch
inside the cooler.
Note: Controllers normally switch the cooler lights off in the
Saving mode.
4.1
‘Limp home’ functionality
As the ems100 Nexo acts as a diagnostic device, and manages various operational functions of the cooler it
serves to prevent faults from becoming critical to the cooler, for example over working of the compressor.
The limp home functionality has been added to the ems100 Nexo controller in order to allow time for
the end user to contact a service engineer in the event of any such problems occurring, while preventing
damage to major cooler components.
4.2
Door open alarms
The ems100 Nexo controllers display d0 to show that the cooler door is open. However, if
the cooler door remains open for the duration defined by alarm delay (Ad) parameter, an
alarm buzzer sounds.
Then, if the cooler door is still open after the time defined by the buzzer duration (b1)
parameter, the controller switches off the compressor and displays three horizontal bars,
for the duration of RT.
Once RT has expired and SP+Dif have been exceeded the controller will enter door open
limp home mode.
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