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my combi boiler's pressure kept on going excessively low. running ?

my combi boiler's pressure kept on going excessively low. running totally out. i checked the piping, there is no leak. i don't know what the problem could be. could you help please
frank, February 2009
thinks it may be your exspansion tank water lost through relief valve you can have an external tank fitted.

vinny j, February 2009