Pressure loss from the boiler is most likely a faulty safety discharge valve. They leak, bleeding pressure from the system - common fault. Easy to replace.
The 'no hot water' problem is likely to be the diverter valve, or the motor that controls it. Again, quite common according to the internet. mine is playing up at the moment.
Have a look at http://www.glow-worm.co.uk/products/pdf/discontinued/boilers/CXI_range.pdf for the boiler manual, which has some useful info in it.
Dave
March 2010
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