KitchenAid Range Error Code F1-E4

F1-E4 on a KitchenAid range indicates the electronic control board has detected a shorted condition on Q8, which is a transistor or switching component on the control board itself. Q8 is an internal component of the board's circuitry, typically responsible for switching power to a relay or output circuit. When the board's self-diagnostic routine detects that Q8 has failed in a shorted state, it throws this fault and may disable affected outputs to prevent further damage. The primary suspect per the manufacturer's diagnostic logic is the control board itself.

For a homeowner, this means the main computer board that controls your range's functions has detected a failure within its own internal electronics. A component called Q8, located on the board, has essentially failed in a way that allows electricity to pass through it when it shouldn't. This is not something that can be repaired by cleaning a sensor or checking a loose wire. The control board will almost certainly need to be replaced to clear this fault and restore normal operation.

This fault does not typically point to an external wiring or sensor problem. Because Q8 is a component soldered onto the control board, the entire board assembly is replaced rather than the individual transistor in most service scenarios.