Handling System Faults; Knx Communications; S-Mode - Siemens RDG200KN Basic Documentation

Functions
4

Handling system faults

4.11 Handling system faults
Temperature out of range
Fault "Er1, Er2, Er3, Er4,
Er5" on display

4.12 KNX communications

4.12.1 S-Mode

94 | 150
If the room temperature exceeds or drops below 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 as soon as the temperature is within the
measuring range.
● If the built-in temperature or humidity sensor fails and no external temperature
sensor is connected, fault message Er1 is displayed on the thermostat. If
EEPROM is damaged, fault message Er2 is displayed on the thermostat.
Replace the thermostat to measure the room temperature.
● If the external / remote temperature sensor fails and no external sensor is
connected, if input X1/X2/U1 is configured as AI except room temp external
sensor/return (AI), fault message Er3, Er4 or Er5 is displayed on the
thermostat. Check related sensor input terminals.
Fault Thermostat
Display
Built-in sensor fails Er1
and no external
sensor is
connected
EEPROM is Er2
damaged
External / remote
Er3
sensor error
External / remote Er4
sensor error
External / remote
Er5
sensor error
For fault status messages on the bus, see Fault and alarms function on KNX
[➙ 99].
RDG2..KN thermostats support communications as per KNX specifications.
S-Mode Standard mode; engineering via group addresses.
LTE-Mode Logical Tag Extended mode, for easy engineering, is used
together with Synco.
This mode corresponds to KNX communications.
Connections are established via ETS by assigning communication objects to group
addresses.
Fault information on bus
Error code Default fault text
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101 [N.X1] sensor error
102 [N.X2] sensor error
103 [N.U1] sensor error
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