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© Wodtke GmbH - Tübingen. All Rights and Changes Reserved.Printed 04/2015 Part No. 950 976
18 Fault Analysis, Fault Codes, Safety Functions and Safety Equip-
ment
The units are equipped with a variety of safety equipment. There are Class 1 and Class 2 errors. Class 1
errors must be manually reset by pressing the I/O button. Class 2 errors are automatically reset.
18.1 Overview of Class 1 Error & Fault Codes (Safety-Related)
In the case of Class 1 errors, the display indicator blinks in alternation with the error code(s). Based
on the error codes (see table), the causes for faults can be clearly defined as component errors or external
errors (customer's sphere). The cause of the fault must then be resolved. The possible causes are described
in the following. In the case of external errors, the system requirements our units require are not being
complied with. Note: If error codes "TL," "TP," "ST" or "RE Er1" are displayed, there is always an external
error.
Attention: In case of a fault, do not disconnect the power plug so that the internal safety functions
can always fully process! Disconnect the power plug before working on the unit.
In the case of Class 1 errors, the following safety function is triggered:
The unit switches to "G OFF" or "Stand-By", the fire slowly goes out. Any automatic operation is
aborted.
The error code and the "G OFF" or "Stand-By-Dot" indicators blink in alternation.
The unit must be restarted via the I/O button after the error is resolved.
Restart / reset in the case of Class 1 errors is only possible if the cause of the error has been
resolved! In case of the error code "ST," the STB must also be unlocked.
The I/O button must be pressed once per error ("Reset" = acknowledge error), that is, press I/O
button 2x in the case of 2 errors.
Fault code
Class 1
Cause of fault
Target values
Resolution of fault
TL HI =
air volume sensor temper-
ature in intake too high
or
TL Grd =
TL temperature rise greater
than 40 °C in 120 seconds
(gradient).
Measurement point: in the
intake pipe [unheated re-
sistor (see arrow) of the air
volume sensor]
Image of sooted sensor
External error (installation or operating
error) Caused by flow reversal in the in-
take pipe.
The air sensor is being heated over the al-
lowed value. TL also responds if the tem-
perature rises too quickly, as this indicates
a flow reversal in the intake pipe.
Caused, for example, by negative pressure
or ventilation system or dust extraction
hood or lack of chimney draught or wind
pressure via exhaust pipe (if no chimney) or
failure of mains voltage (fan). Fault usually
occurs together with sooted air volume sen-
sor see image. This also possible in the
case of a storm and simultaneous failure of
the mains power, if no chimney is con-
nected (in an unauthorised manner) and the
storm can blow directly into the exhaust
pipe.
TL < 85 °C
or
TL rise not
greater than 40
°C in 120 s
Note:
In the case of
standstill of the
exhaust fan in
Stand-By mode,
radiation from
the heated resis-
tor can increase
the values for TL
over the
room/unit tem-
perature. Error
code TL HI is
therefore not
switched active
during Stand-By
mode.
There is not a unit defect!
Allow unit to cool and wait
until TL no longer rises and
is under the threshold.
Find and resolve exter-
nal cause. Only afterwards,
manual reset via I/O button
Note: if the temperature of the
air volume sensor rises due to
exhaust back-flow to values >
120 °C, this is evaluated as a
component error and the indi-
cator LM Er1 appears in the
display (see below). After
cooling, the error can be
cleared if the sensor is still
okay.
53


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