if you mean the dust cap looking thing, i tightened it with my fingers and it didnt do anything.
but i have noticed that the leak is kind of seeping out of the split in the pump, you know where the front is kind of attached to the back by four screws, the front being a silver metallic colour...
well from what i can see, i have have found a picture of where i think the leak is coming from if this helps http://www.uk-plumbing.com/vaillant-pump-160949-pi-42027.html
other than that im stuck for ideas :? but as i say, the fault says f29 or f28 and i can get hot water while i have...
hi i have had the Vaillant TurboMAX plus 824E boiler for about 2 and a half years, and it seems to be leaking water from a pump looking feature with a big screw in the middle, which is situated in the right hand side of the boiler. this only leaks when i give the boiler some pressure, which i...