What the hell is a protherm boiler, never heard of them, is this "another" boiler maker claiming to have been making "qaulity" state of the art boilers since 10BC we have never heard of, just how many different makes all using the same pcb's, gas valves, diverter vavles, pressure switches ect does the public need to confuse them, if you have just fitted this pile of garbage why are you asking on here, GET THE BLOODDY MAKERS TO COME AND LOOK AT IT, I take it you bought it on recommendation, get them to look at it as well if it's suposed to be so blooddy fantastic, or was it sooooooooooo cheap you just "had" to have it.