Frigidaire Oven F40 Error Code — What It Means
The F40 error code (and its variant F41) on a Frigidaire electric range signals a Cooktop Lock Out condition. This is not an oven temperature sensor fault or a probe issue. Frigidaire’s official support documents confirm that F40 and F41 indicate the cooktop is locked, typically due to a latched control state or a glitch in the lockout circuit. The code does not point to a failed temperature sensor like the F30 or F31 codes do.
In most cases the lockout is a temporary control board hiccup rather than a hardware failure. Frigidaire’s published remedy is to reset power to the range for up to 30 seconds. If the code returns after a reset, the issue usually lies in the lockout control circuit, wiring connections, or the electronic control board itself.
Common Causes
- Latched control state after a power event A voltage fluctuation or shutdown can leave the cooktop lockout circuit in a stuck active state.
- Control board glitch The electronic oven control (EOC) or cooktop lockout control board may register a false lockout condition.
- Loose or corroded wiring in the lockout circuit Poor connections between the lockout control board and the EOC can trigger the F40 code.
- Failed cooktop lockout control board The dedicated lockout board may fail and send a constant lockout signal to the main control.
- Faulty electronic oven control (EOC) The main control board itself can develop a fault in the lockout logic or relay circuit.
Step-by-Step Fix
- Turn off power to the range by unplugging it or switching off the dedicated circuit breaker at your panel.
- Wait 30 seconds to allow all capacitors to discharge and the control boards to reset completely.
- Restore power by plugging the range back in or flipping the breaker on, then check if the F40 code has cleared from the display.
- Test cooktop operation by attempting to use a burner to confirm the lockout has released and the code does not immediately return.
- Inspect wiring and connectors behind the control panel if the code reappears, looking for loose pins, corrosion, or damaged insulation in the lockout circuit.
- Replace the cooktop lockout control board if wiring is intact but the code persists, following your model’s service manual for the correct board location and removal procedure.
- Replace the electronic oven control (EOC) if a new lockout board does not resolve the fault, as the main control may have a failed lockout circuit or relay.
Parts Often Needed
| Part | Notes |
|---|---|
| Cooktop Lockout Control Board | Amazon | Verify your model number to order the correct lockout board for your range series. |
| Electronic Oven Control (EOC) | Amazon | Main control board that manages lockout logic and all range functions. |
When to Call a Pro
If the F40 code returns after a power reset and you are uncomfortable working behind the control panel or identifying circuit boards, call a qualified appliance technician. If you have already replaced the lockout control board and the code persists, professional diagnostic equipment is needed to test the EOC and trace the lockout circuit. Frigidaire also recommends contacting service for unresolved fault codes, especially if your range is still under warranty or within the initial install period.