Baxi Combi 133 HE Plus Installation & Servicing Instructions Manual page 34

10.0 Commissioning the Boiler
10.4 Filling the System
1. When filling the system move the diverter valve to
the central heating position as follows;
a) Ensure that no DHW taps are on.
b) Turn power on to the boiler.
c) Ensure that any external controls are calling for heat.
d) After 10 seconds turn the boiler off at the isolation
switch.
e) The diverter valve will now be in the central heating
position. There is no need to reset the position of the
diverter valve after filling.
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© Baxi Heating UK Limited 2005