Hi All, looking for some help with an issue with my rads, as a home owner with little experience. Most of the radiators come on normally and work fine but one in particular, in the bathroom, is not heating up. Added to this, my house has a loft conversion done before my time and I believe the pipes upstairs are connected to this bathroom rad, as they are not coming on properly either. There is hot water coming in one pipe (with the TRV) but not coming out the other (with the lockshield). I have tried bleeding and balancing all the rads (as best I could with little experience) with no effect, also tried different TRVs and turning off other rads but didn't work. I am thinking my next option would be to get someone in to flush the whole system but thought I would ask here for any other suggestions, as I've tried to Google but can't find a solution that I haven't tried, thanks.