Technical data

3.10 Handling faults
When the room temperature is outside the measuring range, i.e. above 49 °C or
below 0 °C, the limiting temperatures blink, e.g. "0 °C" or "49 °C".
In addition, the heating output is activated if the current setpoint is not set to "OFF",
the thermostat is in heating mode and the temperature is below 0 °C.
For all other cases, no output is activated.
The thermostat resumes Comfort mode after the temperature returns to within the
measuring range.
When the built-in sensor fails and no external sensor is connected, the thermostat
shows the fault message “Er1” on the display. The thermostat needs to be replaced
if the room temperature needs to be measured with the built-in sensor.
For fault status messages on the bus, see section 3.11.8.
In the event of a power failure, all working conditions (operating mode, setpoint, fan
stage, all control parameter settings) are stored without time limitation.
When power returns, the thermostat reloads this data and continues to work in the
same conditions as before.
Temperature out
of range
Fault “Er1” on display
KNX
R
Power failure
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Siemens RDF301, RDF301.50..., RDF600KN Basic documentation CE1P3171en
Building Technologies Functions 2014-05-23