KitchenAid Oven Error Code F43

F43 indicates that the oven's control system detected an AC line frequency outside the acceptable 50Hz range (plus or minus 5%) for more than 5 seconds. The oven monitors incoming power frequency as part of normal operation, and this code appears when that frequency deviates too far from the standard. It is typically a power supply issue rather than a problem with the oven itself. The fault clears automatically once the correct frequency is detected.

Start by switching off all other loads on the oven's circuit except the IPC power relay, as a heavily loaded circuit can contribute to the problem. If the error clears, gradually restore other loads to identify the source. If you are running the oven on a generator, switch to utility power or use a high-quality inverter-generator capable of stable 50Hz output. If utility power is the source and the error persists, contact your utility provider or have an electrician test the incoming line frequency.

If the cause is utility grid instability or a generator power source, there may be no repair cost at all since the oven itself does not need a new part. If an overloaded circuit or wiring issue is involved, an electrician's service call typically ranges from $75 to $200 or more depending on the work required. In the rare case where the IPC control board has failed and is misreading the frequency, board replacement parts and labor can range from $150 to $400 or higher depending on the specific board and local labor rates.

The F43 fault is designed to clear on its own once the correct line frequency is restored, not simply by resetting the control. Powering the oven off and back on may temporarily dismiss the display, but if the underlying power frequency issue remains, the code will return. Addressing the power source is necessary for a lasting resolution.

When F43 is active, the oven interrupts normal operation as a protective measure, meaning it will not function correctly until the fault clears. Attempting to use the oven while it is receiving out-of-range frequency power could lead to inaccurate temperature control and timing errors. It is best to wait until the fault resolves before using the oven. If the code appears repeatedly, investigate the power supply before continuing to use the appliance.