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Troubleshooting
Fault messages
(cont.)
Displayed fault
System characteristics
code
F.15
No solar DHW heating or
central heating backup
F.16
No solar DHW heating or
central heating backup
F.29
Regulates without flow tem-
perature sensor for low loss
header.
F.30
Regulates without flow tem-
perature sensor for low loss
header.
F.49
Burner in a fault state
F.50
Burner in a fault state
F.57
Control mode without room
influence
F.58
Control mode without room
influence
F.59
Burner locked out
80
Cause
Lead break, cylinder tem-
perature sensor
Short circuit, cylinder tem-
perature sensor
Lead break, low loss
header sensor
Short circuit, low loss
header sensor
Lead break, flue gas tem-
perature sensor
Short circuit, flue gas tem-
perature sensor
Lead break, room temper-
ature sensor
Short circuit, room tem-
perature sensor
Power supply, low voltage
Measures
Check cylinder temperature sen-
sor.
Measure voltage at sensor input on
electronics module. Set value:
3.3 V
with sensor disconnected
–
Check cylinder temperature sen-
sor.
Measure voltage at sensor input on
electronics module. Set value:
3.3 V
with sensor disconnected
–
Check commissioning assistant
■
setting, low loss header.
Check flow temperature sensor,
■
low loss header.
Measure voltage at sensor input
■
on electronics module. Set value:
3.3 V
with sensor disconnected
–
Check flow temperature sensor,
low loss header.
Measure voltage at sensor input on
electronics module. Set value:
3.3 V
with sensor disconnected
–
Check flue gas temperature sen-
sor.
Reset the appliance.
Check flue gas temperature sen-
sor.
Reset the appliance.
Check commissioning setting of
■
remote control.
Check plug and cable of external
■
room temperature sensor, heat-
ing circuit.
If no external room temperature
■
sensor installed, replace Vitotrol
programming unit.
Check plug and cable of external
room temperature sensor, heating
circuit.
If no external room temperature
sensor installed, replace Vitotrol
programming unit.
Check mains voltage.
If voltage is correct and the fault
occurs repeatedly, replace the fan
unit.
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