Hi everyone. First post so here goes. I have a Bosch Worcester 35CDI II combi boiler. It keeps losing pressure, not by much but gradually goes down slowly from say 1 bar which is what I have it set at to around .7 bar at the moment. I keep topping it up to 1 bar but it loses pressure after a week or so. Now that tells me there is a leak in the system. I have had the gas board look at it because it is under contract and my wife said the fitter poured some liquid into the system to stop the leak but it don't look like it worked. Now my problem. There is no water marks on the downstairs ceiling so that tells me the leak isn't upstairs so I'm assuming it has to be under the front room floor which is hardwood (apart from under the stairs where the electrical consumer unit is). There is no way I'm gonna pull the floor up (assuming the leak is there) so this is what I'm going to do and that's where you lot can help. Coming from upstairs down the wall (hidden under the stairs) and disappearing under the front room floor are the flow and return pipes 1/2 inch copper. If I drain the system and cut the flow and return pipes that feed downstairs rads and then cap both pipes off would I need to join them making the circuit so to speak or just leave them separate. Once I have done that I then fill the system and then monitor the pressure gauge on the boiler to see if it loses pressure and then know for sure if it losses pressure the leak is under the front room floor. I have had dealings with British gas before and don't have a lot of confidence in their fitters. COULD it be that the boiler is losing pressure and causing the pressure drop. Your thoughts please.
dennis
dennis
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