Viessmann VITODENS 222-F Service Instructions Manual page 70

Troubleshooting
Fault Codes
(continued)
Fault code Detailed fault
on display code*2
30 140
38 140
40 -
44 -
48 -
4C -
50 -
51 -
58 -
59 -
*1 Control mode: Boiler/burner fully operational (fault code must be verified and reset).
Burner in fault mode: Boiler control requires manual reset before burner can resume operation.
Burner blocked: If fault cause is corrected, burner resumes operation.
*2 Detailed fault code coding address 38:xx (if available).
70
System behavior*1
Burner blocked
Burner blocked
Mixing valve closes
Mixing valve closes
Mixing valve closes
Mixing valve closes
No DHW heating
With tank loading system:
Tank heating is started and
stopped via tank temperature
sensor 1.
No DHW heating
With tank loading system:
Tank heating is started and
stopped via tank temperature
sensor 1.
Vitodens 222-F B2TB 19 and 35 Service
Cause
Short circuit on boiler
water temperature
sensor
Boiler water temperature
sensor cable broken
Heating circuit 2 with
mixing valve supply
short circuit on
temperature sensor
Short circuit, flow
temperature sensor,
heating circuit 3
(with mixing valve)
Heating circuit 2 with
mixing valve supply
temperature sensor
cable broken
Flow temperature
sensor cable broken
circuit 3 (with mixing
valve)
Short circuit on DHW
tank temperature
sensor %
Short circuit, DHW
tank
temperature sensor 2.
Tank temperature
sensor % cable broken
Lead break, DHW tank
temperature sensor 2.
Corrective action
Check the boiler water
temperature sensor
(see page 79).
Check the boiler water
temperature sensor
(see page 79).
Check the supply
temperature sensor ?@@
(see page 79).
Check flow temperature
sensor (see page 79).
Check the supply temperature
sensor ? (see page 79).
Check flow temperature
sensor (see page 79).
Check the DHW sensor %
(see page 79).
Check the DHW tank
temperature sensor
(see page 79).
Check the DHW sensor %
(see page 79).
Check DHW tank temperature
sensor (see page 79).