We've had a new combi boiler and the pressure is dropping so much that we have to top up 3/4 times a day.
I had the people back who put it in and they said it was probably a leak in the old pipes which are under the floor. There are no visible signs of a leak but they recommended putting Fernox F4 in to try and seal the leak. I have done this and it has been in for a week with no discernible difference, the plumber said it may take 2 weeks to "cure", is he right or should it be sooner than that?
I had the people back who put it in and they said it was probably a leak in the old pipes which are under the floor. There are no visible signs of a leak but they recommended putting Fernox F4 in to try and seal the leak. I have done this and it has been in for a week with no discernible difference, the plumber said it may take 2 weeks to "cure", is he right or should it be sooner than that?