Fault Display; Weather-Compensated Control Unit; Fault Codes - Viessmann Vitoladens 300-W Installation And Service Instructions For Contractors

Troubleshooting

Fault display

Weather-compensated control unit

In the event of a fault, red fault indicator
" " flashes on the display and "Fault" is shown.
A
R
bar
Fig. 34
Press OK to display the fault code.
For an explanation of the fault code, see the following
pages.
For some faults, the type of fault is also displayed in
plain text.
Acknowledging a fault
Follow the instructions on the display.
Note
■ The fault message is transferred to the standard
menu.
■ Any fault message facility connected will be switched
off.
If an acknowledged fault is not remedied, the fault
■
message will be redisplayed the following day and
the fault message facility restarted.

Fault codes

Fault code dis- System characteristics
played
10 Controls as if the outside
temperature were 0 °C
18 Controls as if the outside
temperature were 0 °C
19 Controls as if the outside
temperature were 0 °C
20 Regulates without flow tem-
perature sensor (low loss
header)
66
flashes. Calling up acknowledged faults
A
Select "Fault" in the standard menu. Current faults will
be listed.
Calling up fault codes from the fault memory (fault
history)
The 10 most recent faults (including those remedied)
are saved and can be called up.
Faults are sorted by date.
1. Press OK and
2. "Fault history"
3. "Display?"
Deleting the fault history
1. Press OK and
2. "Fault history"
3. "Delete?"
Cause
Short circuit, outside tem-
perature sensor
Lead break, outside tem-
perature sensor
Communication interrup-
tion, outside temperature
sensor RF
Short circuit, system flow
temperature sensor
simultaneously for approx. 4 s.
å
simultaneously for approx. 4 s.
å
Measures
Check outside temperature sensor
(see page 72)
Check outside temperature sensor
(see page 72)
Check wireless connection (place
outside temperature sensor RF
close to the wireless base station).
Wireless base station instal-
lation and service instruc-
tions
Replace outside temperature sen-
sor RF.
Check low loss header sensor (see
page 73)