Help!!! Am feeling very fed up. We had a Grant Vortex oil-fired combi-condenser fitted just over 2 years ago. Needless to say it's now out of guarantee. Started getting problems with the pressure dropping frequently in the autumn, and our installer came to the conclusion that we were having to top it up too often. Then the heating started to fail to come on when it should, though the programmer seemed to be working ok. Phones Grant and technician was puzzled as an intermittent fault, but sent us pcb as he thought that the likely problem. Had that fitted end of December but in the two months since, heating and (sometimes) hot water failing - intermittently - to come on as set. Sometimes pressure 0.25 or below, sometimes still up at 1. Our engineer fitted a new programmer yesterday. All well this morning, but now the heating has failed to come on again this afternoon and I have discovered there's no hot water either. I'm really fed up - our last boiler lasted 20 years with no problems, and the one we have now was the top of the range, so it was a lot of expense, especially as we had to change the old pipework too. Has anyone any experience of solving similar problems??