78
Displayed fault
code
System characteristics Cause Measures
425 System in control mode, cal-
culation out of operation.
Calculation values can be
viewed via software tool.
Time synchronisation
failed
Set the time.
446 Burner in a fault state Deviation, heat generator
flow temperature sensor/
high limit safety cut-out
Check the flow temperature sen-
sor/high limit safety cut-out.
Check plug-in connection and lead
to sensor.
Reset the appliance.
447, 448 Burner in a fault state Deviation, ionisation volt-
age signal/Ionisation cur-
rent
Replace the HBMU heat manage-
ment unit. See chapter "Replacing
the HBMU heat management unit".
Reset the appliance.
449, 450, 451,
452
Burner in a fault state Error in scheduled pro-
gram run monitoring
Reset the appliance. If the fault oc-
curs repeatedly, replace the HBMU
heat management unit. See chap-
ter "Replacing the HBMU heat
management unit".
453 Burner in a fault state Synchronisation error, se-
quence
Reset the appliance. If the fault oc-
curs repeatedly, replace the HBMU
heat management unit. See chap-
ter "Replacing the HBMU heat
management unit".
454 Burner in a fault state Incorrect HBMU heat
management unit parame-
ter set
Flash correct HBMU heat manage-
ment unit parameter set.
455, 456 Burner in a fault state Error in program run moni-
toring
Reset the appliance. If the fault oc-
curs repeatedly, replace the HBMU
heat management unit. See chap-
ter "Replacing the HBMU heat
management unit".
457 Burner in a fault state Fan sluggish or blocked. Reset the appliance.
Check fan for sluggishness. In the
case of severe contamination or
grinding noises, replace fan unit.
463 Burner in a fault state Contaminated combustion
air, flue gas recirculation
Check flue system for contamina-
tion and flue gas recirculation.
Clean flue system if required.
Reset the burner.
Note
Deposits on the electrodes indicate
foreign bodies in the combustion
air. Check the installation room and
flue system for causes of the de-
posits. For example: Laundry de-
tergents, cleaning agents, toilet-
ries, deposits in the ventilation air
supply (chimney).
If burner gauze assembly and ioni-
sation electrode have been re-
placed, also clean fan unit, gas/air
channel and Venturi extension.
Reset the appliance.
Troubleshooting
Fault messages (cont.)
6167586
Diagnosis
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