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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

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

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.

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