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0020308121_04 Installation and maintenance instructions 81

Code/meaning Possible cause Measure

F.090

Communication with the internal

cylinder has been interrupted.

Interruption in the wiring har-

ness

▶ Check the wiring harness including all plug connections and, if

required, replace it.

Plug on PCB loose/not plugged

▶ Check the plug and the plug connection.

F.092

The gas-type conversion was

not completed correctly.

Gas conversion in D.156 not

completed

▶ Check the setting in D.156.

F.095

The gas valve stepper motor

has reached the minimum per-

missible step number.

Fault in the flue gas route

caused by recirculation or flue

gas blockage

▶ Check the entire flue gas route.

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.

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.

Fault in the electrical connection

for the gas valve assembly

▶ Check the wiring harness between the PCB and gas valve

assembly, including all plug connections.

Control electrode defective ▶ Check and, if required, replace the control electrode.

PCB defective ▶ Replace the PCB.

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.096