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Fault display
If the burner control unit recognises a fault, the fault
display is automatically activated:
■
In the case of a non-lockout fault, the fault LED illu-
minates.
■
In the case of a lockout fault, the fault LED illumi-
nates. The fault code flashes.
Status Service
Fig. 24
Fault code of the most recent fault, see table from
A
page.
Calling up the fault history (fault memory)
The 10 most recent faults (including those remedied)
are saved and can be called up. The fault messages
are ordered chronologically, the most recent fault mes-
sage is shown first.
If no key is pressed within 20 s, the fault memory dis-
play terminates automatically.
Note
If the burner repeatedly starts up due to a non-lockout
fault, but does not display a fault code, the fault mem-
ory may give an indication of the cause.
Calling up the fault memory
Press the following buttons:
1. S
longer than 2 s; " " flashes.
Fault memory under menu "4"
"Service" display
Description
1
Fault codes display
2
Detailed fault codes
3
Clear fault memory.
Note
The 10 most recent faults (including those rectified)
are saved respectively in both fault memory "1" (dis-
played fault codes) and "2" (detailed fault codes).
Clear fault memory
Press the following buttons:
1. S longer than 2 s; " " flashes.
2.
until "4" is shown under "Service".
Fault history:
—
1. Remedy the fault. For fault codes and measures,
see the following chapter. Carry out measures in
the indicated order.
2. Hold down reset button R for longer than 0.5 s.
The operating display is shown. The burner control
unit is reset.
Note
Faults are also shown as text and fault codes on the
Vitotronic control unit display. The burner control unit
can also be reset here.
Vitotronic control unit operating instructions
2.
until "4" is shown under "Service".
3. S
to confirm; "4" is shown under "Status". "1" is
shown under "Service".
4. /
for the required fault memory: See the table
below
5. S
to confirm; the selected fault memory is shown
under "Status".
6. /
to scroll through the fault codes.
7. S
to change to the operating display.
3. S to confirm, "4" is shown under "Status" and "1" is
shown under "Service".
4.
until "3" is shown under "Service".
5. S to confirm, "1" is shown under "Status" and
"dEL" under "Service".
6. S to confirm the deletion. If deletion was success-
ful, "1" is shown under "Service"; if it failed, "0" is
shown.
7. S to change to the operating display.
Troubleshooting
37
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