Whirlpool · Oven
Whirlpool Oven F04 Error Code
Oven temperature sensor open circuit
What this error means
F04 means the temperature sensor circuit reads infinite resistance—an open wire or fractured RTD element. Without sensor feedback the ERC will not modulate heat and displays F04 with a continuous alert beep.
How F04 is detected
When F04 appears on a Whirlpool oven, the control board has confirmed that water did not leave the machine within the programmed drain window. On Whirlpool WFE505W0BS, Whirlpool WFG505M0BS, and similar variants, the drain pump runs for a fixed interval—often three to seven minutes on washers and dishwashers—while a pressure switch or turbidity sensor verifies the tub or sump is empty. If water remains, the cycle stops to prevent spin with a full tub or overflow on the next fill.
Most F04 calls are resolved without parts: pull the range forward and confirm the sensor plug is firmly seated at the erc. Restricted drain paths mimic pump failure because the impeller spins against a blocked hose or filter. Document whether the pump hums audibly during the drain step; a humming pump with no water movement points to a clogged filter or kinked hose, while silence may indicate a failed pump motor or loose wiring at the harness.
After clearing blockages, run a short cycle and listen at the drain hose for steady water flow. If F04 returns on the next load with a clean filter and straight hose, measure resistance at the pump motor connector per the service manual for your model before ordering a replacement pump assembly.
Common causes
- Sensor connector vibrated loose behind the range
- Broken conductor inside the sensor wire at the rear wall grommet
- Fractured RTD element inside the probe tip
- Corroded connector pins from heat exposure at the ERC plug
Step-by-step fixes
- 1Pull the range forward and confirm the sensor plug is firmly seated at the ERC
- 2Measure sensor resistance at the disconnected plug—OL/infinite at room temp means open
- 3Inspect the wire where it passes through the oven rear wall for a visible break
- 4Install a new oven temperature sensor if the probe reads open
When to call a technician
Harness repair inside the oven cavity requires pulling the unit—book service if the sensor is good but F04 persists.
Affected models
- Whirlpool WFE505W0BS
- Whirlpool WFG505M0BS
- Whirlpool WGE745C0FS
Prevention & maintenance
- Clean drain filters and hose terminations monthly on high-use ovens to prevent F04 from lint and food debris buildup.
- Record when F04 appears in the cycle and whether it clears after a 60-second power reset on your Whirlpool oven—that detail speeds diagnosis if you call service.
- Keep the model and serial number from the rating plate when ordering parts for F04; Whirlpool uses multiple revisions with different harness lengths and board firmware.
- Photograph wiring connector orientation before disconnecting any component while troubleshooting F04; reversed plugs on pumps and valves cause immediate repeat faults.