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11. Fault rectification
Problem Description / Reason Correction
Refrigeration unit is not
running.
Power plug is not
connected.
Connect the power plug and check the mains fuse. If you cannot determine a
defect, contact an expert company. The supply voltage and frequency must
always match the values speci ed on the type plate.
Mains voltage not
applied
Check whether the voltage speci ed on the type plate is applied.
Check whether the fuse protection is also ensured according to the ratings on
the type plate.
Ensure voltage supply.
Evaporator fan
starts up brie y, but
the display is not
working.
Check wire connections of bus lines. The display connection must always
remain plugged in to the upper socket!
In the bus operation, the connection between the power boards is not speci-
ed.
Mains voltage not
applied
Check whether the voltage speci ed on the type plate is applied.
Check whether the fuse protection is also ensured according to the ratings on
the type plate.
Ensure voltage supply.
The fuse on the PCB
(base board) always
trips.
Check wiring of door contact switch. The n-conductor always switches! Short
circuit occurs when mixed up! Unplug door contact connection (X2) and try
again. If the fault is still present, unplug devices (connectors X3A to X3H) and
try again. Work on electrical systems must only be conducted by quali ed
electricians.
Refrigeration unit is run-
ning, but the display is not
working.
Refrigeration unit is
running, but the dis-
play is not working.
Brie y press the rotary knob. If still no display, check wire connections of the
bus lines. The display connection must always be plugged into the upper
socket of the power board! (see Electrical circuit diagram, Page 66 to 69)
After the “Time Lighting” process (main menu “Settings”, sub-menu “Control
Panel”), the display will go to sleep.
Thermal detector defective.
• RF–breakage / short
circuit
• Liquefaction detector not
working correctly
• Log. detector not working
correctly
One or more detec-
tors are defective.
Up to 4 thermal detectors PT1000are built into the EVO-COOL®. The display
will show which detector is defective (e.g. Log. detector not working correctly).
To change a detector, please contact your refrigeration specialist.
If the machine is not longer running, you may turn on the emergency opera-
tion with the DIL switch on the main board. The machine will then continue
running without temperature regulation and defrosting.
The refrigeration specialist company must be contacted immediately for
maintenance!
If the condenser, evaporator and/or condenser fan are not running and the
solenoid valve for the uid line has been actuated, a damage on the PCB is pre-
sent which prevents the selection. The emergency run is then also no longer
ensured.
Fault with the package
detector.
The package detec-
tor is defect.
If the message ‘Package detector fault’ appears, a check must be conducted
to see if the evaporator is covered in ice. Before replacing the detector, first
remove the ice and check the detector’s position. The detector must not touch
the evaporator’s tubes. If the detector touches the tubes, the defrost period
is too short and the ice does not melt as the defrost temperature is reached
prematurely.
High pressure. Fault within the
refrigeration cycle
regarding high
pressure.
The safety pressure switch (pressostat) has been activated. If the fault does
not disappear following acknowledgement, please contact your refrigeration
specialist. The safety circuit can contain not only the high pressure switch but
also other components. (See the circuit diagram on pages 66 to 69).
Unit runs continuously and the evaporator ices over.
Attention: Before working on electrical components and on the unit the equipment must always be disconnected from mains!
Risk through electrical power and rotating (fan) and hot parts (pipes, condenser, heat exchanger)!
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