How to cure low pressure on a Bosch 24i combi?

this model it can be removed with it on wall but you have to remove pump, heatexchangers, cut the band holding it in. you can check the vessel for pressure located on the vessel is a valve same as a car if you have car pressure gauge check it. it should be about 1 bar and also see if water is released from valve if so its faulty.you can use a foot pump to get it back up to 1 bar but the system must be empty of water

hi-spec plumbing
December 2006