Viessmann B1KA Installation And Service Instructions Manual page 60

Troubleshooting
Diagnosis
(continued)
Diagnostics table: Faults with fault display on control unit
Fault code in System
display window characteristics*
Burner blocked
0A
Burner blocked
0b
Burner blocked
0C
Constant mode
10
Constant mode
18
Burner blocked
30
Burner blocked
38
No DHW heating
50
No DHW heating
51
Burner blocked
52
No DHW heating
58
No DHW heating
59
Burner blocked
5a
Burner blocked
aA 3
Regulated operation
a9
without OpenTherm
device
Burner blocked
b0
Emergency mode
b7
Burner blocked
b8
60
Vitodens 100-W, B1HA/B1KA 26 to 125 Combi Installation/Service
Cause
1
CO limiter (if installed) has
responded. CO concentration
too high.
Gas pressure switch (if installed)
has responded.
Gas pressure too low.
Low water, pump or flow switch
defective
Mains voltage too low
Outdoor temperature sensor
shorted out
Outdoor temperature sensor
wire broken
Boiler water temperature sensor
shorted out
Boiler water temperature sensor
wire broken
Tank temperature sensor
shorted out
Outlet temperature sensor
shorted out
Flow sensor shorted out
Tank temperature sensor
wire broken
Outlet temperature sensor wire
broken
Flow sensor wire broken
Flue gas temperature sensor
incorrectly positioned.
No flame formation during
sensor test.
Communication fault
OpenTherm device
Flue gas temperature sensor
shorted out
Burner control unit fault
Flue gas temperature sensor
wire broken
Corrective measures
Check the heating system. Remove
the cause of escaping CO.
Check the gas supply.
Check water pressure, circulation pump,
flow switch
Check the power supply.
Check the optional outdoor temperature
sensor and wiring (see page 63).
Check the outdoor temperature sensor and
wiring (see page 63).
Check the boiler water temperature sensor
(see page 62).
Check the boiler water temperature sensor
(see page 62).
Check sensor
(see page 67)
Check sensor
(see page 67).
Check connections and wire;
replace sensor if required.
Check sensor. (see page 67)
Check the sensor (see page 67).
Check connections and wire; replace sensor
if required.
Position flue gas temperature sensor
correctly.
It may be necessary to repeat the sensor
test several times.
Check connections and wire; replace
OpenTherm device if required.
Check sensor
(see page 66).
Reset boiler control
Check sensor
(see page 66)