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Error code Description
Er 24
Heating plate temperature has ex-
ceed the SAFE TEMP H (Hotplate)-
setting
Er 25
Heating switching element
monitoring
Er 26
Difference between the internal
heating plate control and safety
temperature sensors is too large
Er 31
Fault in the heating switch element
(Triac)
Er 41
Stirring bar breakaway
WD
In remote operation (PC) with
(Watch watchdog function 2 enabled:
Dog)
No communication between PC
and RET control / t
022009
Cause
• SAFE TEMP H (Probe) is set a tem-
perature lower than the heating plate
actual temperature.
• Breakage of the heating plate tempe-
rature control sensor
• There is a short-circuit in a switching
element (Triac) of the heating control
circuit
• Safety relay has shutdown the heating
circuit.
• The heating or the connection is
broken
• The heating plate safety temperature
sensor is broken.
• Irregular temperature distribution on
the heating plate due to point heat
dissipation
• Fault in the control or safety tempe-
rature sensors.
• Stirring bar has broken away on four
consecutive occasions without any
changes to the setpoint value.
• PC does not send OUT_WDx@m
data during the watchdog time
• The connection/cable to the PC is
broken
Effect
Solution
Heating OFF
• Allow the heating plate to cool.
• Set SAFE TEMP H (Hotplate) to a
higher temperature.
Heating OFF
• Switch off the unit. Allow it to cool down
and then switch on again.
Heating OFF
• Switching off the unit. Allow in to cool
down and then switch on again.
• When using metal blocks on the heating
plate surface, ensure regular heat
dissipation
Heating OFF
The setpoint speed is
• Select a lower speed setpoint.
reduced to 300 rpm
• Kleineres Rührstäbchen wählen
(min.)
Heating OFF
The setpoint temperature • Change the watchdog time.
is set to the WD safety
• Send data from the PC within the
temperature
watchdog time (OUT_WD@m).
The setpoint speed is set
• Check the connector cable and plug.
to the WD safety speed
45
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