Fault Codes - Viessmann Vitocrossal 100 Series Service Instructions For Contractors

Fault display
(cont.)
Calling up acknowledged faults
Hold down OK for approx. 4 s.
The 10 most recent faults (including those remedied)
are saved and can be called up.
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.

Fault codes

Faults without fault display
Fault
Burner blocked; 3 is displayed in code 38
(code 2/boiler)
Fault code dis- System characteristics
played
10 Regulates as if the outside
temperature were 0 °C.
18 Regulates as if the outside
temperature were 0 °C.
19 Regulates as if the outside
temperature were 0 °C.
20 Regulates without flow tem-
perature sensor (low loss
header)
28 Regulates without flow tem-
perature sensor (low loss
header)
30 Burner blocked
38 Burner blocked
40 Mixer is being closed.
1. Press OK and
2. Select "
ã
3. Select fault messages with / .
Deleting the fault history
While the list is displayed, press OK until
Confirm with OK.
Cause of fault
Combustion chamber pressure
limiter has responded or con-
necting cable to the combustion
chamber pressure limiter is bro-
ken.
Cause
Short circuit, outside tem-
perature sensor
Lead break, outside tem-
perature sensor
Communication interrup-
tion, wireless outside tem-
perature sensor
Short circuit, system flow
temperature sensor
Lead break, system flow
temperature sensor
Short circuit, boiler water
temperature sensor
Lead break, boiler water
temperature sensor
Short circuit, flow temper-
ature sensor, heating cir-
cuit 2 (with mixer)
Troubleshooting
simultaneously for approx. 4 s.
å
". Enable fault history with OK.
Measure
Check combustion chamber
pressure limiter, connection
hose, burner and flue system;
see page 14
Reset the combustion chamber
pressure limiter.
Measures
Check outside temperature sensor
(see page 77).
Check outside temperature sensor
(see page 77).
Check wireless connection (place
wireless outside temperature sen-
sor close to the wireless base sta-
tion). Forget outside temperature
sensor, then pair again.
Wireless base station instal-
lation and service instruc-
tions
Replace wireless outside tempera-
ture sensor.
Check the low loss header sensor
Check the low loss header sensor
If no low loss header sensor is
connected, set code 52:0.
Check boiler water temperature
sensor (see page 78)
Check boiler water temperature
sensor (see page 78)
Check flow temperature sensor.
flashes.
65