78 Installation and maintenance instructions 0020308121_04
Code/meaning Possible cause Measure
F.044
The ionisation signal for the
control electrode is too low. The
drift adaptation has failed.
Interruption in the wiring har-
ness
▶ Check the wiring harness including all plug connections and, if
required, replace it.
Burner defective ▶ Check and, if required, replace the burner.
Gas valve assembly defect-
ive/incorrect spare part gas
valve assembly
▶ Check and, if required, replace the gas valve assembly.
Gas valve assembly offset in-
correctly stored in D.052 und
ggf. D.182
▶ Check the offset setting for the gas valve assembly.
Control electrode defective ▶
Check and, if required, replace the control electrode.
Gas valve defective ▶ Replace the gas valve.
PCB defective ▶ Replace the PCB.
F.047
The signal for the domestic hot
water temperature sensor at the
output for the internal cylinder is
implausible.
Fault in the electronic connec-
tion for the cylinder outlet tem-
perature sensor
▶ Check the wiring harness between the PCB and sensor, in-
cluding all plug connections.
Cylinder outlet temperature
sensor defective
▶ Replace the cylinder outlet temperature sensor.
F.049
The eBUS has short-circuited or
two active eBUS sources have
inverted polarity.
Short circuit in the eBUS con-
nection
▶ Check all eBUS connections.
Different polarities at the eBUS
connection
▶ Check the polarity (±) of the eBUS connections.
PCB defective ▶ Replace the PCB.
F.057
The combustion regulation has
failed and the associated limp
home mode has failed.
Limp home mode failed ▶ Check the limp home mode and fault history, and carry out the
required measures.
Fault in the flue gas route
caused by recirculation or flue
gas blockage
▶ Check the entire flue gas route.
Air intake pipe blocked ▶ Check and, if required, replace the air intake pipe.
Condensate in the combustion
chamber due to a blocked con-
densate discharge
1. Check and, if required, clean the condensate discharge pipe
including the siphon.
2. Check the combustion chamber (electrodes, insulating mats,
burner).
3. If required, replace the insulating mats in the combustion
chamber.
Condensate pump (if fitted)
defective
▶ Check and clean the condensate pump. Replace the condens-
ate pump, if required.
Gas flow pressure too low ▶ Check the gas flow pressure and the external gas pressure
switch.
Gas valve assembly offset in-
correctly stored in D.052 und
ggf. D.182
▶ Check the offset setting for the gas valve assembly.
Interruption in the wiring har-
ness
▶ Check the wiring harness including all plug connections and, if
required, replace it.
PCB defective ▶ Replace the PCB.
Fan defective ▶ Use D.033 and D.034 to check whether the fan speed deviates
by more than 20–30 rpm.
Air-mass flow sensor dirty or
defective (only in conjunction
with the conversion set compris-
ing the air intake pipe with in-
tegrated non-return valve and
air-mass flow sensor)
1. Check the air-mass flow sensor for dirt.
2. If required, replace the entire air intake pipe.
F.061
The ASIC or µControl does not
run in the defined times.
Fault in the electrical connection
for the gas valve assembly
▶ Check and, if required, replace the wiring harness for the gas
valve assembly.
PCB defective ▶ Replace the PCB.
F.062
The flame switch-off was detec-
ted after a delay.
Gas valve defective ▶ Replace the gas valve.
PCB defective ▶ Replace the PCB.
Ignition electrode defective ▶ Check and, if required, replace the ignition electrode.
F.063
EEPROM reports faults during
the read/write test.
PCB defective ▶ Replace the PCB.
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