Retrieving Fault Codes From The Fault Memory (Fault History); Troubleshooting - Viessmann VITODENS 200-W WB2B Start-Up/Service Instructions

Diagnostics
(continued)
Retrieving an acknowledged fault message

Retrieving fault codes from the fault memory (fault history)

Fault history
I
1 18
Fault codes
Fault code on display
0F
10
18
20
28
30
38
1. Press " " for approx. 3 sec.
2. Press "⊕ /
acknowledged fault.
The ten most recent faults are saved and can be scanned.
The faults are in order of date, so the most recent fault is fault number 1.
1. Press "rw" + "
simultaneously for approx. 2 sec.
2. Press "⊕ /
codes.
3. Note! All saved fault codes can be
deleted by pressing " ".
4. Press " " to finish scan.
*1
System behavior
Control mode
Boiler operates based on out-
door temperature of 32 °F/
0 °C
Boiler operates based on out-
door temperature of 32 °F/
0 °C
Regulates without supply
temperature sensor (low-
loss header)
Regulates without supply
temperature sensor (low-
loss header)
Burner blocked
Burner blocked
" to select the
"
" for individual fault
Cause
Service
Outdoor temperature sensor
shorted out
Outdoor temperature sensor
cable broken
System supply temperature
sensor shorted out
System supply temperature
sensor cable broken
Boiler water temperature
sensor shorted out
Boiler water temperature
sensor cable broken

Troubleshooting

Corrective action
Service the equipment.
After the service, reset cod-
ing address "24" to"0".
Check the outdoor tempera-
ture sensor (see page 62).
Check the outdoor tempera-
ture sensor (see page 62).
Check the low-loss header
sensor (see page 62).
Check the low-loss header
sensor (see page 62).
Check the boiler water tem-
perature sensor (see
page 62).
Check the boiler water tem-
perature sensor (see
page 62).
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