It's not a combi boiler. We have rads upstairs and wet underfloor downstairs. Oil fired boiler. Filling loop is not left connected. Any other info you may need? No visible leaks from the rads but as for the underfloor?
I keep losing the pressure in my water system and have had to top up the water to restore the pressure each day for the last three days. Does anyone have any suggestions as to what the problem might be or how I can remedy it. Thanks