Fault
code
Error description
Explanations/causes
350
Storage buffer address error
351
Primary controller/supply pump address error
352
Low-loss header address error
353
Common flow sensor B10 missing
371
Flow temperature 3 (Heating circuit 3) monitoring
372
Temperature monitor HK3
373
Expansion module 3 fault (collective fault)
378
Repetition counter internal fault expired
382
Repetition counter fan fault expired
384
External light
385
Mains undervoltage
386
Fan speed has left valid range
387
Air pressure switch fault
426
Feedback flue damper
427
Configuration flue damper
432
Functional earth X17 not connected
(1) Switch off, start prevention, re-start after elimination of fault
(2) Check parameter in accordance with table Check the installer adjustment table and program to the basic settings or query internal LMS
SW diagnosis code and correct the corresponding parameter faults according to fault specification
(3) switch-off and locking; can only be unlocked by reset
For more information, see
Description of the function of the air pressure monitor, page 23
11.2 Fault finding
11.2.1 Fault message
If the fault symbol appears on the display there is a fault in the heating
system.
1. Press the information key.
Further information about the fault is displayed
See
Fault code table
For more information, see
11.2.2 Fault switch-off
A fault switch-off is a safety-switch off in the case of flame failure during
operation. After every safety switch-off a new ignition attempt is carried out
as per program. If this does not result in flame formation a fault switch-off
occurs.
In case of fault switch-off, the reset button on the control panel should be
pressed.
In case of operation disturbances (bell symbol in the display), the digit in
the display on the operating panel indicates the cause of the disturbance
(see fault code table).
R
A-0
0
0
0
0
1
8
11 Troubleshooting
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