0020308118_05 Installation and maintenance instructions 91
Code/meaning Possible cause Measure
F.347
Condensate has been detected
in the combustion chamber. The
burner operation is interrupted.
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.
F.363
The display's EEPROM reports
errors during the read/write test.
Display electronics defective ▶
Replace the display.
F.707
No communication is possible
between the display and the
PCB.
Communication between the
display and the PCB is interrup-
ted
1. Check the connection between the display and the PCB.
2. If required, replace the cable between the display and the
PCB.
3. If required, replace the display or the PCB.
F.905
Communication interface
switched off
Overcurrent at the communica-
tion interface
1. Check the connection between the PCB and the modules
that are connected to the interface.
2. Check the connected modules and replace these, if
required.
G Check programmes
Note
Since the code table is used for various products, some codes may not be visible for the product in question.
Check programmes (P.XXX) can temporarily block L.XXX codes.
Check programme Meaning
P.000 Purge programme The internal pump is cyclically actuated. The heating circuit and the domestic hot water circuit are
adaptively purged by automatically switching the circuits using the automatic air vent (the automatic
air vent's flap must be loose). The active circuit is shown in the display. Press once to start pur-
ging the heating circuit. Press once to end the purge programme. The duration of the purge pro-
gramme is displayed using a countdown. The programme then ends.
P.001 Adjustable load After successful ignition, the product is operated at the set heat input (query at the start of the pro-
gramme).
P.003 Maximum heat load After successful ignition, the product is operated at the partial heat load that was set under D.000.
P.008 Filling of product with
water
The prioritising diverter valve is moved to the mid-position. The burner and pump are switched off (to
fill or drain the product).
P.021 Help for ignition dia-
gnostics
The programme is used to analyse the ignition in the event of fault message F.028. This checks
whether ignition can be successfully carried out. In this case, the flame is not monitored via the
control electrode. If the ignition has been carried out successfully, appears permanently on the
display during the check programme.
H Actuator test
Note
Since the code table is used for various products, some codes may not be visible for the product in question. Actu-
ator tests (T.XXX) can temporarily block L.XXX codes.
Code Meaning
T.001 Internal pump The internal pump is switched on and regulated at the selected differential pressure.
T.002 3-port valve The prioritising diverter valve is moved to the heating or domestic hot water position.
T.003 Fan The fan is switched on and off. The fan runs at maximum rotational speed.
T.004 Cylinder charging pump The cylinder charging pump is switched on and off.
T.005 Circulation pump The circulation pump is switched on and off.
T.006 External pump The external pump is switched on and off.
T.007 Min. modulation Product starts up and switches to minimum load. The flow temperature is shown in the display.
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