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6. Heating system control
2
3
4
5
6
7
Self-Test
The burner regularly checks the connected sensors. During this self-test, the burner does not
execute any other tasks.
Ventilation, Exhaust Ventilation
During the ventilation and the exhaust phase, the number „3“ is shown in the display.
Ignition
During the ignition process the number „4“ is shown in the display. If there is an aborted start, then
a new start will be attempted according to the diagram in item 1.h. A total of 4 start attempts are
permitted before the unit registers a malfunction.
Operating Mode Heat
During the heating operation the target temperature is shown in the two-digit display. If the „service“
button is pressed during the heating operation, the actual temperature is displayed.
Operating Mode Hot Water
During the DHW operation the display shows the target temperature. If the „service“ button is
pressed during the heating operation, the actual temperature is displayed.
Warm Water Heating Operation in Comfort Mode (only TopGas
®
combi) or Freeze Protec-
tion
If freeze protection is active or if the heat exchanger is heated to a set temperature for the comfort
mode, then “7” is shown in the display.
