Siemens RDF301 Basic Documentation page 42

Fan overrun for electric
heater
Fan failure
Clean fan filter
reminder
K NX
R
Fault information
Fan in Auto Timer
mode
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Siemens
Building Technologies
When the electric heater is switched off, the fan overruns for 60 seconds
(parameter P54) to avoid overtemperature of the electric heater or prevent the
thermal cutout from responding.
In case of fan failure, the thermostat cannot protect the electric heater against
overtemperature. For this reason, the electric heater must feature a separate safety
device (thermal cutout).
The "Clean fan filter reminder" function counts the fan operating hours and displays
message "FIL " to remind the user to clean the fan filter as soon as the threshold
is reached. This does not impact the thermostat's operation, which continues to run
normally.
The "Clean filter reminder" is reset when the operating mode is manually set to
Protection and back.
In Auto Timer mode , the default fan mode is automatic. The fan mode can be
changed to Manual by pressing the FAN button. The fan returns to the automatic
default mode after each switchover from Comfort to Economy mode, and vice
versa.
RDF301, RDF301.50 Basic documentation
Functions
CE1P3171en
22 Jun 2010