Hi, this is Worcester, Bosch Group
Our technical team can help with enquires, please call 0844 892 3366.
Alternatively we have a boiler repressurisation section in our FAQ pages on our website which may help you. See following link:
http://www.worcester-bosch.co.uk/homeowner/products/frequently-asked-questions/boiler-repressurisation/i-have-got-low-system-pressure-how-do-i-re-fill-the-system
We look forward to helping you
Worcester, Bosch Group, April 2010