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Hi Thanks for
using FixYa. F3 error means Open oven temperature sensor or thermal fuse. You’ll need
to replace oven temperature sensor or thermal fuse to resolve the issue. Please do accept the solution
if the issue is resolved or else revert for further assistance. Thanks Rylee
On this model, F03 indicates a faulty power control board (also known as the "Capricorn" board by Whirlpool technicians). A new oven with no guarantee? There is usually a reason something has no guarantee, in your case, a faulty control board. It is a relatively expensive part unfortunately.
You can try disconnecting from power, removing top panel from oven. The large square electronic board you see on the top of oven is the power control board. Check all plug connections are OK, especially the large thin multi plug that goes to the display board- I have had a poor connection at this plug causes F03 faults. If still no go, power control board will need replacing
f03 error is a sensor error.you could have taken an ohm reading on the thermistor to see if it was bad.if you replaces the t-mistor then the only other component responsible is the board.make sure all the connections on the board are clean and tight before you replace it.