Viessmann Vitodens 050-W Installation And Service Instructions Manual page 47

Fault display
(cont.)
Displayed System characteris-
fault code tics
52 Burner blocked
59 No DHW heating
5 A Burner blocked
A9 Control mode without
OpenTherm influ-
ence
b0 Burner blocked
b8 Burner blocked
E3 Burner in a fault
state
E5 Burner blocked
F0 Burner blocked
F1 Burner in a fault
state
F2 Burner in a fault
state
Cause
Short circuit, flow
sensor
Lead break, outlet
temperature sen-
sor
Lead break, flow
sensor
Communication er-
ror, OpenTherm
device
Short circuit, flue
gas temperature
sensor
Lead break, flue
gas temperature
sensor
Fault in safety
chain
Internal fault
Internal fault
Max. flue gas tem-
perature exceeded
Temperature limit-
er has responded
Troubleshooting
Measures
Check connections and
lead; replace sensor if re-
quired.
Check sensor (see
page 54).
Check connections and
lead; replace sensor if re-
quired.
Check connections and
lead; replace OpenTherm
if required.
Check sensor (see
page 55).
Check sensor (see
page 55).
Check the temperature
limiter and connecting ca-
bles (see page 53).
Check the ionisation elec-
trode and connecting ca-
bles.
Replace control unit.
Check heating system fill
level. Check circulation
pump. Vent the system.
Check heating system fill
level. Check circulation
pump. Vent the system.
Check the temperature
limiter and connecting ca-
bles (see page 53).
Press "Reset" (see
page 49).
47