Apologies for the lack of technical detail here. My Ravenheat combi 84ET failed to supply heat via central heating yesterday. I switched the boiler off at the mains then switched it back on after a couple of minutes and it appeared to be working ok - supply available through radiators. However, it cut off after only a few minutes - no operational noises (fans, burners etc). I double checked the fault symptoms by reseting it again and the same fault conditions apply. Would anyone be able to give me any pointers as to possible causes for this.