Technical data

75
5600 332 - 06
Vitodens 100-W, WB1B Installation & Service
Diagnosis (continued)
Start-up and Maintenance
Start-up and Maintenance
Diagnostics table: Faults with fault display on control unit
Faults are indicated by a flashing fault code with fault
code symbol “U” on the display.
For fault code explanations see the following table.
Fault code in
display window
System
characteristics*
1
Cause Corrective measures
10
Constant mode Outside temperature sensor
shorted out
Check the optional outside temperature
sensor and wiring (see page 78).
18
Constant mode Outside temperature sensor
wire broken
Check the outside temperature sensor and
wiring (see page 78).
30
Burner blocked Boiler water temperature sensor
shorted out
Check the boiler water temperature sensor
(see page 77).
38
Burner blocked Boiler water temperature sensor
wire broken
Check the boiler water temperature sensor
(see page 77).
50
No DHW tank
heating or external
heat demand
Jumper connection shorted out,
removed or missing
Install PPM jumper
(see page 31)
51
No DHW heating
with CombiPLUS
only
Outlet temperature sensor
shorted out
Check sensor
(see pages 29 and 82).
52
Burner blocked (with
CombiPLUS only)
Flow sensor shorted out
(in CombiPLUS)
Check connections and wire;
replace sensor if required.
58
No DHW heating (used
with storage tanks)
Jumper connection shorted out,
removed or missing
Check PPM jumper. (see page 31)
59
No DHW heating (with
CombiPLUS only)
Outlet temperature sensor wire
broken
Check the sensor (see page 29).
5a
Burner blocked Flow sensor wire broken Check connections and wire; replace sensor
if required.
a9
Regulated operation
without OpenTherm
device
Communication fault
OpenTherm device
Check connections and wire; replace
OpenTherm device if required.
b0
Burner blocked Flue gas temperature sensor
shorted out
Check sensor
(see page 80).
b8
Burner blocked Flue gas temperature sensor
wire broken
Check sensor
(see page 80)
e5
Burner blocked Internal fault Check the ionization electrode and
connecting cable. Press reset (see page
69).
f0
Burner blocked Internal fault
Replace the control unit.
*
1
Constant mode: Boiler operates based on “tr” temperature setting
Burner blocked: If fault cause is corrected, burner resumes operation.
Burner in fault mode: Boiler control requires manual reset before burner can resume operation.
Troubleshooting