Frigidaire Range Showing SF and Not Responding in Oldsmar: A Sabbath Mode Lockout, Cleared Without Parts

A client in the East Lake Woodlands neighborhood of Oldsmar called because their Frigidaire Gallery electric range (model FGEH3047VFD) had stopped working. The display just showed SF next to the clock, and none of the buttons did anything, not even OFF.

What SF means

SF stands for Sabbath failure. Sabbath mode keeps the oven on bake with no tones and no display changes, for households that don’t operate appliances on the Sabbath. If the range is in Sabbath mode when the power goes out or flickers, the control can lock itself up afterward. The range looks completely dead, but nothing is actually broken.

How we fixed it

Before resetting anything, we checked the control. The board and the touch panel were both working, so this wasn’t a failed part. Then we reset the control by the manufacturer’s procedure. SF cleared, and the range went back to normal. No parts needed.

If you see SF on your Frigidaire range, try this first. Press and hold Self Clean and Steam Clean together for 3 seconds, until you hear a tone. That should clear it. If it doesn’t, or it keeps coming back, give us a call so we can check the control.

Frigidaire oven fault codes from the service sheet

Tucked inside this range was its service data sheet, for Frigidaire electric ranges with the 5xx oven control. SF isn’t on its fault code list, because it isn’t a hardware fault. But the sheet explains the F codes these ranges can show, so here they are in plain words.

Code	What it means	What the sheet says to do
F01, F02, F04, F05	Touch panel failure	Cut power for 30 seconds. If it comes back, replace the control assembly (user interface board and touch panel).
F03	User interface board configured wrong	Replace the control assembly with the latest revision for the model.
F10	Oven temperature runaway, the oven got too hot	Cut power, check the oven temperature sensor and replace it if needed. If the sensor is good and it keeps overheating, replace the relay board.
F11	Stuck key, pressed for 30 seconds or more	Make sure nothing is resting on the panel. If it won’t clear, check the wiring to the touch panel, then the touch panel itself.
F12, F13, F15	Keyboard or memory errors	Cut power for 30 seconds. If it comes back, replace the control assembly.
F16, F17	The board can’t read the burner knobs or set up the touch panel	Check the knobs are off, cut power for 30 seconds, then check the harnesses.
F18, F19	Oven relay board failure or setup problem	Check the connection between the boards, then replace the relay board or control.
F22, F23, F25, F27, F28, F29	The boards or the touch panel aren’t talking to each other	Cut power for 30 seconds, test the wiring harness between them, then replace the failed board.
F30	Open oven temperature sensor	Check the sensor wiring and test the sensor’s resistance against the chart.
F31	Shorted oven temperature sensor	Same as F30. Replace the sensor if it reads wrong, then the relay board if the problem stays.
F33	Meat probe shorted or too hot	Make sure the probe is pushed fully into the socket and into the food, then test it.
F50	Relay board can’t read the door switch, door lock or sensors	Check those connections.
F90, F95, F97	Motorized door lock problem	Cut power for 30 seconds, then check the lock motor, lock switch and relay board.
F96	The door opened during self clean	Make sure the door closes fully and presses the door switch, then test the switch and its wiring.

The sheet also has the chart for the oven temperature sensor. It should read about 1,090 ohms at room temperature (75°F), about 1,650 ohms at 350°F and about 2,700 ohms at 900°F. A reading way off from that points to a bad sensor.

Here’s the wiring diagram from the same packet, for anyone working on one of these ranges.

Working again

The range works normally again, and the client didn’t pay for any parts. If a range suddenly goes dead or shows a code, a reset sometimes fixes it, but the control should be checked first. More on our oven and range repairs.