73
Fault number
on the display
System characteristics
Cause
Measures
F.7
No DHW heating
Lead break, cylinder tem-
perature sensor
Check cylinder temperature sensor
(see page 91).
F.8
No DHW heating
Short circuit, cylinder tem-
perature sensor
Check cylinder temperature sensor
(see page 91).
F.9
No DHW heating
Lead break, outlet temper-
ature sensor DHW
Check DHW outlet temperature
sensor (see page 91).
F.10
No DHW heating
Short circuit, outlet tem-
perature sensor DHW
Check DHW outlet temperature
sensor (see page 91).
F.13
Regulates as if the outside
temperature were 0 °C.
Lead break, outside tem-
perature sensor
Check outside temperature sensor
(see page 91).
F.14
Regulates as if the outside
temperature were 0 °C.
Short circuit, outside tem-
perature sensor
Check outside temperature sensor
(see page 91).
F.29
Regulates without flow tem-
perature sensor (low loss
header)
Lead break, low loss
header sensor
Check the low loss header sensor.
F.30
Regulates without flow tem-
perature sensor (low loss
header)
Short circuit, low loss
header sensor
Check the low loss header sensor.
F.49
Burner in a fault state
Flue gas temperature sen-
sor disconnection
Check flue gas temperature sensor
(see page 91).
Reset the appliance.
F.50
Burner in a fault state
Short circuit, flue gas tem-
perature sensor
Check flue gas temperature sensor
(see page 91).
Reset the appliance.
F.55
Burner in a fault state
Lead break, CO sensor
Check CO sensor.
Reset the appliance.
F.56
Burner in a fault state
Short circuit, CO sensor
Check CO sensor.
Reset the appliance.
F.57
Control mode without room
influence
Lead break, room temper-
ature sensor
Check external room temperature
sensor of heating circuit or room
temperature sensor of remote con-
trol unit.
F.58
Control mode without room
influence
Short circuit, room tem-
perature sensor
Check external room temperature
sensor of heating circuit or room
temperature sensor of remote con-
trol unit.
F.59
Burner locked out
Power supply, low voltage Check the power supply.
F.62
Burner in a fault state
High limit safety cut-out
has responded.
Check heating system fill level.
Check circulation pump. Vent the
system.
Reset the appliance.
F.63
Burner in a fault state
Flue gas temperature lim-
iter has responded.
Check heating system fill level.
Vent the system.
Reset the appliance once the flue
system has cooled down.
Troubleshooting
Fault messages
6130884
Service
