80 Installation and maintenance instructions 0020308118_05
Code Meaning
S.092 The self-test for the circulation water volume is active.
S.093 A flue gas analysis is not currently possible.
S.096 The self-test for the return temperature sensor is active. The heat demands are blocked.
S.097 The self-test for the water pressure sensor is active. The heat demands are blocked.
S.098 The self-test for the flow and return temperature sensor is active. The heat demands are blocked.
S.109 The standby mode is active.
S.175 The installation assistant is in progress and all demands are blocked.
S.199 The unit is automatically filled with water.
S.326 The hydraulic sensor and actuator test is active.
S.328 The external pump runs continuously and is not connected to the unit.
S.335 Checking whether a flue gas blockage is present.
S.341 The unit temporarily decreases the load to the minimum modulation due to long, permanent burner
operation.
S.599 The unit has a fault.
F Fault codes
Note
Since the code table is used for various products, some codes may not be visible for the product in question.
Note
Due to a condensate blockage test after the last ignition attempt, fault messages F.028, F.029 and F.347 appear
after a delay. Wait for the fault displays.
Code/meaning Possible cause Measure
F.000
The signal for the flow temper-
ature sensor has been interrup-
ted.
Fault in the electrical connection
for the flow temperature sensor
▶ Check and, if required, replace the wiring harness between the
PCB and sensor, including all plug connections.
Flow temperature sensor de-
fective
▶ Check and, if required, replace the flow temperature sensor.
F.001
The signal for the return tem-
perature sensor has been inter-
rupted.
Fault in the electrical connec-
tion for the return temperature
sensor
▶ Check and, if required, replace the wiring harness between the
PCB and sensor, including all plug connections.
Return temperature sensor de-
fective
▶ Check and, if required, replace the return temperature sensor.
F.002
The signal for the domestic hot
water connection temperature
sensor has been interrupted.
Fault in the electrical connection
for the domestic hot water tem-
perature sensor
▶ Check and, if required, replace the wiring harness between the
PCB and sensor, including all plug connections.
Domestic hot water temperature
sensor defective
▶ Check and, if required, replace the domestic hot water temper-
ature sensor.
F.003
The signal for the cylinder tem-
perature sensor has been inter-
rupted.
Fault in the electrical connection
for the cylinder temperature
sensor
▶ Check and, if required, replace the wiring harness between the
PCB and sensor, including all plug connections.
Cylinder temperature sensor
defective
▶ Check and, if required, replace the cylinder temperature
sensor.
F.010
The flow temperature sensor
has short-circuited.
Fault in the electrical connection
for the flow temperature sensor
▶ Check and, if required, replace the wiring harness between the
PCB and sensor, including all plug connections.
Flow temperature sensor de-
fective
▶ Check and, if required, replace the flow temperature sensor.
F.011
The return temperature sensor
has short-circuited.
Fault in the electrical connec-
tion for the return temperature
sensor
▶ Check and, if required, replace the wiring harness between the
PCB and sensor, including all plug connections.
Return temperature sensor de-
fective
▶ Check and, if required, replace the return temperature sensor.
F.012
The domestic hot water con-
nection temperature sensor has
short-circuited.
Fault in the electrical connection
for the domestic hot water tem-
perature sensor
▶ Check and, if required, replace the wiring harness between the
PCB and sensor, including all plug connections.
Domestic hot water temperature
sensor defective
▶ Check and, if required, replace the domestic hot water temper-
ature sensor.
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