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I have a Bosch/Worcester CD28i Combi boiler that is about 7 years old. Just lately the pressure gauge is always on zero? I can recharge the system but it will soon drop to zero again.
I have checked for leaks and cannot find any. The only thing I have noticed that is different of late is a mild banging in the morning when the heating comes on. It lasts about 2-3 minutes then settles down. We've had mild noises in the past but generally it just seems to be expansion of pipes or radiators and it soon settles.
Another observation. If I put the heating on MAX then the pressure gauge will start showing 2.3 bar which seems very high to me. I usually pressurise to 1 bar but within an hour it is back to zero again.
Heating and water are both hot and working??!!
Hope someone can help please.