Vaillant VCW 2O Instructions For Installation And Servicing page 49

Cheek Operaling ol Heating System (Sheet 3)
Check Operation ot Domestic Hot Water System (Sheel 6)
Check switch lor Domestic Hot Water (She6t 5)
Note 1 : Detach the Jollowing parts oithe control box:
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unscrew the cover of the terminal box
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unscrew upper part ot control box (2 screws) and
press it a little bit upwards
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unscret/v knob of boiler thermostat
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unscrew front panel ot control box with switch group
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pull off multicontactplugs Aand B
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remove printed circuit by loosening the two screws
beside the switch group
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install new orinted circuit
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