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low pressure on combi boiler?

I have an ikon combination boiler which is losing pressure every night, in the morning I top it up to between 1.5 and 2 bar pressure run heating alldy, next morning pressuer is zero, have checked all pipework, no leaks, can any one advise
gordon, December 2010
you do have a leak you just havent found it yet

Paul, December 2010
could be the presure release valve passing .check your outside pipe

cav, December 2010
link Click here to see other fixes for Ikon ikon combination boiler.