Dacor HWO230PS Heritage Wall Oven F4 Error Fix: Open Oven Temperature Sensor (RTD)

Error code F4 on the Dacor HWO230PS Heritage Wall Oven means: Open Oven Temperature Sensor (RTD). The oven temperature sensor (RTD) has an open circuit. The sensor resistance is reading infinite (open), indicating a broken sensor element or disconnected wiring. Check the sensor harness and connection between the oven sensor and the oven control board. Measure the sensor resistance — at room temperature (75°F), it should read approximately 1080-1100 ohms. If the reading is infinite (OL on multimeter), the sensor wire is broken internally. Check both wire connections at the sensor and at the control board. Replace the RTD sensor if wiring is intact.

The most successful fix is "Test and Replace Open Oven Temperature Sensor (RTD)" (medium difficulty, ~45 minutes). Estimated DIY cost: $20-$30. HomeMD has 2 community-ranked fixes for this error.

This error is rated high severity. You should address it promptly — continued use could cause damage or safety concerns.

Yes — the top-ranked community fix ("Test and Replace Open Oven Temperature Sensor (RTD)") is rated medium difficulty and takes about 45 minutes. Tools needed: T20 Torx screwdriver, Digital multimeter.

DIY cost: $20-$30. Professional repair typically costs $150-$220. Many homeowners save money by trying the top-ranked community fix first.

The Dacor HWO230PS Heritage Wall Oven has 8 other known error codes, including: F0 (Function Key Stuck), F1 (System Watchdog Circuit Fault), F2 (Heating Mode Over-Temperature), F3 (Shorted Oven Temperature Sensor (RTD)), F7 (Door Lock Enabled Above Temperature), and 3 more.

Error code F4 also appears on 5 other Dacor models: DOB30M977DS 30 in 4.8 cu ft True Convection Wall Oven with WiFi, DOC30M977DS 30 in 4.8 cu ft Combination Wall Oven with Microwave and True Convection, DOP48M96DPS 48 in 6 Burner 5.5 cu ft 18,000 BTU Modernist Dual Fuel Range, DP36M96NDS Pro 36" Dual Fuel, ER30DSCH Distinctive Dual-Fuel Range. The fix may vary by model, so check each model's specific page for tailored repair steps.