In September I had a Valiant boiler fitted in my 2 bedroom house. It hasn’t worked properly ever since. Every time I put the heating on my pressure drops from 1.5 to 0.3 bars and I get the spanner showing and the heating turns off and I have to add more water to bring bar level back up. I’ve bled my radiators and as far as I know haven’t got any leaks in my radiators as have wood flooring throughout so my floor would lift wouldn’t it if it was getting wet from a leak, albeit large or small. My heating engineer can’t find the problem. Does anyone have any ideas. I am due to rent my property next year and need to get sorted before I do. Valiant have said their boiler is not at fault.