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hot water makes a loud noise on my biasi 24s combi?

when the hot taps are turned on the Biasi 24s combi boiler it makes a loud gurgling noise and sometimes the water gets hot and sometimes not also downstairs rads are struggling to get hot could this be the diverter valve or the diaphragm ?
Geoff Mac, December 2006
Sounds more like air in the appliance if its gurgling... Ensure the boiler is at 1bar of water pressure and all the rads are fully bled...

Otherwise I would suggest that possibly your pump is to blame.

GasAid.co.uk, December 2006