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since ive started using the heating this year i have had to top up my combi boiler 3 times i fill it to 1.5bar and then the next time i go to use it has low to no preasurei cant see any sighns of a leak and i wonderd if it had anything to do with the expansion vessle i would be very greatful for...

I have a combi boiler and when i put the central heating on after 1 hour a whistleing/loud noise comes from the radiator in the bedroom ive tried bleeding it but their seems to be no air in their. if i turn the radiator of the noise stops idont know how to fix this problem and would be very...