HI i have fitted a diamond h et54001/215 thermostat to replace a 47thc30/230 top oven which was overheating , this cured the fault but the inner grill element does not work , outer element ok , the new thermostat has 3 connections on the thermostat end A B & C have fitted cables to C&B what is A for , or can any one supply me with a wiring diagram . the switch connections on the inside have the same numbers so ithink i am ok there Thanks Steve