Whirlpool oven fault f03 shown

Question

Hava a Whirlpool Generation 2000+ wall oven (model no; G2p 90F/WH). Error F03 is shown on display. Looking on the net this fault appeared to relate to the oven temperature sensor (thermistor). I replaced this part, but still have F03 on the oven. I'm thinking the main control pcb is at fault. Before I splash out on a new part can anyone confirm this is the fault for sure?