Viessmann Vitodens 333 Service Instructions Manual page 77

Fault codes
(cont.)
Display Const. Weath.
fault comp.
code
E5 X X
E8 X X
E9 X X
EA X X
Eb X X
EC X X
System char- Cause
acteristics
Burner Fault flame
blocked amplifier
Burner control The ionisa-
unit fault tion current
lies outside
the permissi-
ble range
Burner control The ionisa-
unit fault tion current
lies outside
the permissi-
ble range
during cali-
bration
Burner control The ionisa-
unit fault tion current
lies outside
the permissi-
ble range
during cali-
bration
Burner control Heat draw
unit fault off repeat-
edly too low
during cali-
bration
Burner control The ionisa-
unit fault tion current
lies outside
the permissi-
ble range
during cali-
bration
Troubleshooting
Remedy
Check the ionisa-
tion electrode and
leads. Check the
flue gas system
for soundness.
Press "E" and re-
place the control
unit, if required.
Check the ionisa-
tion electrode and
lead.
Press "E".
Check the ionisa-
tion electrode and
lead.
Check the flue
gas system for
soundness.
Press "E".
Check the ionisa-
tion electrode and
lead.
Press "E".
Initiate heat draw
off and trigger
manual calibra-
tion (see
page 88).
Press "E".
Check the ionisa-
tion electrode and
lead.
Press "E".
77