84 Installation and maintenance instructions 0020308118_05
Code/meaning Possible cause Measure
F.035
The air/flue pipe is blocked.
Condensate pump (if fitted)
defective
▶ Check and clean the condensate pump. Replace the condens-
ate pump, if required.
Insufficient combustion air sup-
ply
▶ Check the combustion air supply.
Control electrode defective ▶ Check and, if required, replace the control electrode.
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.
F.040
The air ratio is too low.
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.
Incorrect gas type set ▶ Check the gas type and the gas type setting under D.156 and
D.157.
Gas valve assembly offset in-
correctly stored in D.052 und
ggf. D.182
▶ Check the offset setting for the gas valve assembly.
Fault in the electrical connection
for the gas valve assembly
▶ Check and, if required, replace the wiring harness for the gas
valve assembly.
Gas valve assembly not elec-
trically connected/incorrectly
connected
▶ Check the electrical connection to the gas valve assembly.
Control electrode defective ▶ Check and, if required, replace the control electrode.
Burner defective ▶ Check and, if required, replace the burner.
PCB defective ▶ Replace the PCB.
Fan defective ▶ Check and, if required, replace the fan.
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.042
The coding resistor (in the wir-
ing harness) or the gas group
resistor (on the PCB, if avail-
able) is invalid.
Interruption in the wiring har-
ness to the gas valve assembly
▶ Check the wiring harness between the PCB and gas valve
assembly, including all plug connections (especially on the
PCB).
F.044
The ionisation signal for the
control electrode is too low. The
drift adaptation has failed.
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.
Incorrect gas type set ▶ Check the gas type and the gas type setting under D.156 and
D.157.
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