Display
fault
code
Const.
Weath.-
comp.
System char-
acteristics
Cause
Remedy
E5
X
X
Burner
blocked
Internal fault
Check the ionisa-
tion electrode and
leads. Check the
flue gas system
for soundness.
Press "
E
" and re-
place the control
unit, if required.
E8
X
X
Burner control
unit fault
The ionisa-
tion current
lies outside
the permissi-
ble range
Check the ionisa-
tion electrode and
lead.
Press "
E
".
E9
X
X
Burner control
unit fault
The ionisa-
tion current
lies outside
the permissi-
ble range
during cali-
bration
Check the ionisa-
tion electrode and
lead.
Press "
E
".
EA
X
X
Burner control
unit fault
The ionisa-
tion current
lies outside
the permissi-
ble range
during cali-
bration
Check the ionisa-
tion electrode and
lead.
Press "
E
".
Eb
X
X
Burner control
unit fault
Heat draw-
off repeat-
edly too low
during cali-
bration
Initiate heat draw-
off and trigger
manual calibra-
tion (see
page 91).
Press "
E
".
EC
X
X
Burner control
unit fault
The ionisa-
tion current
lies outside
the permissi-
ble range
during cali-
bration
Check the ionisa-
tion electrode and
lead.
Press "
E
".
Fault codes
(cont.)
80
Troubleshooting
5692
569
GB
Summary of Contents for Vitodens 300
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