I have what I consider to be a "standard" (but Oil Fired) C/H & H/W system, my hot water is fine no problems. My C/H however, is not; I noticed a louder than usual noise from Pump (possibly Grundfos Selectric UPS 15-50, located in airing cupboard with boiler) and switched off C/H to investigate, now pump does not start when C/H switched on, despite bleeding (there was some air in rads and pump, now gone). I strongly suspect I have a broken pump but before I call someone to come out (replacing pump beyond my skills (and tools!)), can anyone offer any advice? Searching forums I haven't found anything related.