Thermador PRD366WGU Pro Grand Range F8 Error Fix: Oven Door Lock Motor Failure

Error code F8 on the Thermador PRD366WGU Pro Grand Range means: Oven Door Lock Motor Failure. The oven door lock motor has failed or is stuck, preventing the door from locking during self-clean or safety cycles. The oven will not start cleaning or may show a door locked error.

The most successful fix is "Replace Door Lock Motor (DIY)" (medium difficulty, ~45 minutes). Estimated DIY cost: $25-$45. HomeMD has 2 community-ranked fixes for this error.

This error is rated medium severity. It should be addressed soon, but your appliance may still function in a limited capacity.

Yes — the top-ranked community fix ("Replace Door Lock Motor (DIY)") is rated medium difficulty and takes about 45 minutes. Tools needed: Phillips screwdriver, Nut driver, Multimeter.

DIY cost: $25-$45. Professional repair typically costs $110-$190. Many homeowners save money by trying the top-ranked community fix first.

The Thermador PRD366WGU Pro Grand Range has 8 other known error codes, including: F0 (Electronic Oven Control Failure), F1 (Electronic Oven Control Failure), F10 (Control Board Communication Error), F11 (Oven Temperature Sensor Short Circuit), F12 (Oven Control Board Overvoltage Protection Triggered), and 3 more.

Error code F8 also appears on 5 other Thermador models: MED301JS 30 in Masterpiece Series Single Wall Oven with 4.3 cu ft Capacity and Steam Bake, PODS301W 30 in Wall Oven with 4.3 cu ft Capacity and Convection Cooking, PRD486WDGU Pro Grand 48", PRL366WG 36 in Pro Grand Range with 5 Burners, 22,000 BTU Power Burner, and Convection Oven, T36BT925NS 36 in 20.9 cu ft Freedom® Collection French Door Refrigerator with WiFi Connectivity and ThermaFresh System. The fix may vary by model, so check each model's specific page for tailored repair steps.