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Bedienungsanleitung Steuerung S4_2006_09_25-neu.doc Page 30 / 83
© wodtke GmbH Tübingen. All rights reserved. Subject to change without notice. Month of issue xx/2007 Art. No. 950 281
7 Error Analysis, Error Codes, Safety Functions and Safety
Devices
All stoves are equipped with numerous safety devices. Errors are classified as class 1 or class 2
errors. Class 1 errors must be reset manually by pressing the I/O key. Class 2 errors are
reset automatically.
7.1 Overview of class 1 errors & error codes (safety-relevant)
Class 1 errors are indicated by the operating state and error code(s) blinking alternately.
The error codes (see table) enable you to identify errors as either component errors or external
errors (relating to building installations). The first thing is to remove the cause of the error.
Possible causes are described in the following. External errors only occur when the system
requirements of our products are not met. Note: as a rule, error codes “TL”, “TP”, “ST” and “RE
Er1” usually indicate external errors.
Note: Do not pull the plug in the event of an error, since this would interrupt the internal
safety functions midway! Only pull the plug before performing work on the appliance.
Class 1 errors always trigger the following safety function:
The appliance switches to “G OFF” or “Stand By”, and the fire gradually goes out. Any
automatic operation is broken off.
The error code and the message “G OFF” or “stand-by dot” blink alternately.
After the error has been corrected the appliance must be restarted using the I/O key.
Restart/ Reset after class 1 errors is only possible if the cause of the error has been
removed! In the event of error code “ST” you also have to release the temperature cutoff
STB.
Press the I/O key once for every error (“Reset” = error acknowledgement), for ex. in the
event of 2 errors press the I/O key twice.
Class 1
error code Cause of error Desired
values How to correct error
TL HI =
Temperature at air flow
sensor in suction pipe
too high
or
TL Grd =
Temperature rise TL
greater than 40 °C in 120
seconds (gradient).
Measuring point: in
suction pipe [unheated
resistor (see arrow) of air
flow sensor]
Photo of foul sensor
External error (
installation or
operating error). Caused by flow
reversal in suction pipe.
The air flow sensor has heated up
beyond the permissible limit. A TL
error is also triggered when
temperature rises too fast, as this also
points to flow reversal in the suction
pipe.
Possible causes include negative
pressure due to ventilation system,
exhauster hood or lack of chimney
draught or wind pressure via vent pipe
(if there is no chimney) or power
failure (fan). This error is usually
associated with a foul air flow sensor –
see picture. If, contrary to the
requirements, there is no chimney, this
can also occur in the event of a storm
with power failure when the wind
blows directly into the vent pipe.
TL < 85 °C
or
TL rises by no
more than 40
°C per 120 s
Note:
When flue gas
fan is motionless
in stand-by
mode, heat
radiation from
heated resistor
can cause TL to
rise above room
or appliance
temperature. For
this reason error
code TL HI is
inactive in
standby mode.
This is no hardware error!
Let appliance cool off or
wait until TL is no longer
rising and lower than
desired value.
Search for and correct
external cause. Only then do
manual reset via I/O key.
Note: If the temperature of the
air flow sensor rises to values
> 120 °C as a result of flue
gas flow reversal, this is
interpreted as a component
error, and the message LM
Er1 appears in the display
(see below). If the sensor is
still in good order, this error
can be reset after
temperature has returned to
the permissible range.
30


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