Viessmann Vitodens 050-W Installation And Service Instructions Manual page 69

Fault messages
(cont.)
Displayed fault System characteristics
code
405 Burner in a fault state
406, 408, 410 Burner in a fault state
416 Burner locked out
417, 418 Burner in a fault state
425 System operating normally;
calculation not working
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
Cause
Ionisation electrode earth
fault, HBMU heat man-
agement unit faulty
HBMU heat management
unit faulty
Flue gas temperature sen-
sor incorrectly positioned
HBMU heat management
unit faulty
Time synchronisation
failed
Deviation, heat generator
flow temperature sensor/
high limit safety cut-out
Deviation, ionisation volt-
age/ionisation current sig-
nal
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.
Troubleshooting
Measures
Check IO electrode for earth fault.
If the fault persists, replace the
HBMU heat management unit. See
chapter "Replacing the HBMU heat
management unit".
Reset the appliance.
Replace the HBMU heat manage-
ment unit. See chapter "Replacing
the HBMU heat management unit".
Reset the appliance.
Fit flue gas temperature sensor
correctly. See "Repairs".
Carry out mains reset after fault
has been remedied.
Replace the HBMU heat manage-
ment unit. See chapter "Replacing
the HBMU heat management unit".
Reset the appliance.
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.
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