● Correct the defects.
● Check again as described before, if there is any CO or CO2in the fresh air.
● If you cannot correct the defects you must not start up the boiler.
● Check for ignition and an even flame on the burner.
● Perform a function check on the heating system (see Section 7.1.).
● Perform a function check on the domestic hot water system (If applicable optional
accessories are fitted) (see section 7.1.1
7.2 Heating
Fig. 7.1 Display indicator during heating mode
● Switch on the appliance.
● Make sure that there is a heating demand.
● Press “i” to activate the status indicator.
As soon as a heat demand is received, the appliance runs through the status indicators “S. 1” to
“S. 3”, until the appliance is running correctly in normal mode and the display shows “S. 4”.
7.3 Domestic hot water (If optional VR65, uniSTOR cylinder & Vaillant control are
installed)
● Switch on the appliance.
● Fully open the hot water tap.
● Press “i” to activate the status indicator. If the water heating is working correctly, the
display shows the following: “S.24”.
Fig. 7.2 Display indicator during water heating
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