Fault Codes - Viessmann Vitodens 222-F Installation And Service Instructions For Contractors

Fault codes

Fault code dis- System characteristics
played
0F Control mode
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)
21 Control mode
Display fault in energy cock-
pit
22 Control mode
Display fault in energy cock-
pit
23 Control mode
Display fault in energy cock-
pit
24 Control mode
Display fault in energy cock-
pit
25 Control mode
Display fault in energy cock-
pit
26 Control mode
Display fault in energy cock-
pit
27 Control mode
Display fault in energy cock-
pit
28 Regulates without flow tem-
perature sensor (low loss
header)
2A Control mode
Display fault in energy cock-
pit
30 Burner blocked
38 Burner blocked
Cause
Service
"0F" is only displayed in
the fault history.
Short circuit, outside tem-
perature sensor
Lead break, outside tem-
perature sensor
Communication error,
wireless outside tempera-
ture sensor
Short circuit, system flow
temperature sensor
Sensor outside tolerance
range
Sensor outside tolerance
range
Incorrect commissioning
DHW circulation pump not
working
Transfer pump not work-
ing
DHW circulation pump
and transfer pump not
working
Incorrect commissioning
Lead break, system flow
temperature sensor
Solar circuit flow and re-
turn interchanged.
Short circuit, boiler water
temperature sensor
Lead break, boiler water
temperature sensor
Troubleshooting
Measures
Perform maintenance.
Note
After servicing, set code "24:0".
Check outside temperature sensor
(see page 97)
Check outside temperature sensor
(see page 97)
Check wireless connection (place
wireless outside temperature sen-
sor close to the wireless base sta-
tion). Forget outside temperature
sensor, then pair again. Replace if
required (see "Wireless base sta-
tion" installation and service in-
structions).
Check low loss header sensor (see
page 98)
Check sensors on DHW cylinder
and collectors.
Check sensors on DHW cylinder
and collectors.
Determine solar circuit flow rate
and enter value established.
Check setting of parameter 39
("General" group). If required, car-
ry out an actuator test.
Check setting of parameter 20
("Solar" group). If required, carry
out an actuator test.
Check settings of parameter 39
("General" group) and parameter
20 ("Solar" group). If required,
carry out an actuator test.
Determine solar circuit flow rate
and enter value established.
Check low loss header sensor (see
page 98)
If no low loss header sensor is
connected, set code 52:0.
Check solar circuit flow and return
and swap over if required.
Check boiler water temperature
sensor (see page 98)
Check boiler water temperature
sensor (see page 98)
89