I bought a Whirlpool double oven AKZ161 and error code F03 appear
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
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