Viessmann VITODENS 100-W Installation And Service Instructions Manual page 58
Wall mounted gas condensing boiler
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Also See for VITODENS 100-W:
- Installation instructions manual (204 pages) ,
- Installation and service instructions manual (105 pages) ,
- Manual (84 pages)
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Troubleshooting
Fault messages
(cont.)
Displayed fault
System characteristics
code
425
System in control mode, cal-
culation out of operation
Calculation values can be
viewed via software tool
446
Burner in a fault state
447, 448
Burner in a fault state
449, 450, 451,
Burner in a fault state
452
453
Burner in a fault state
454
Burner in a fault state
455, 456
Burner in a fault state
457
Burner in a fault state
463
Burner in a fault state
58
Cause
Time synchronisation
failed
Deviation, heat generator
flow temperature sensor/
high limit safety cut-out
Deviation, ionisation volt-
age signal/ionisation cur-
rent
Error in scheduled pro-
gram run monitoring
Synchronisation error, se-
quence
Incorrect HBMU heat
management unit parame-
ter set
Error in program run moni-
toring
Fan sluggish or blocked.
Contaminated combustion
air, flue gas recirculation
Measures
Set the time.
Check the flow temperature sen-
sor/high limit safety cut-out.
Check plug-in connection and lead
to sensor.
Reset the appliance.
Replace the HBMU heat manage-
ment unit. See chapter "Replacing
the HBMU heat management unit".
Reset the appliance.
Reset the appliance. If the fault oc-
curs repeatedly, replace the HBMU
heat management unit. See chap-
ter "Replacing the HBMU heat
management unit".
Reset the appliance. If the fault oc-
curs repeatedly, replace the HBMU
heat management unit. See chap-
ter "Replacing the HBMU heat
management unit".
Flash correct HBMU heat manage-
ment unit parameter set.
Reset the appliance. If the fault oc-
curs repeatedly, replace the HBMU
heat management unit. See chap-
ter "Replacing the HBMU heat
management unit".
Reset the appliance.
Check fan for sluggishness. In the
case of severe contamination or
grinding noises, replace fan unit.
Check flue system for contamina-
tion and flue gas recirculation.
Clean the flue system if necessary.
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.
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