Maytag · Oven
Maytag Oven F03 Error Code
Open oven temperature sensor
What this error means
F03 on Maytag wall ovens and ranges means the oven temperature sensor (RTD) circuit is open. The board cannot regulate bake or broil without a valid probe signal.
How F03 is detected
When F03 appears on a Maytag oven, the control board has confirmed that water did not leave the machine within the programmed drain window. On Maytag MEW7630FZ, Maytag MER8800FZ, 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 F03 calls are resolved without parts: shut off power at the breaker. 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 F03 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 plug loose behind the rear panel
- Broken sensor wire inside the oven cavity routing
- Failed RTD probe internally open
- Connector corrosion from steam at the broil element
Step-by-step fixes
- 1Shut off power at the breaker
- 2Remove the rear lower panel and reseat the sensor harness
- 3Measure probe resistance—about 1080 ohms at room temperature on many models
- 4Replace the probe if resistance reads infinite
When to call a technician
New probe with correct ohms but persistent F03 indicates main clock or ERC wiring service.
Affected models
- Maytag MEW7630FZ
- Maytag MER8800FZ
- Maytag MGR8800FZ
Prevention & maintenance
- Clean drain filters and hose terminations monthly on high-use ovens to prevent F03 from lint and food debris buildup.
- Record when F03 appears in the cycle and whether it clears after a 60-second power reset on your Maytag oven—that detail speeds diagnosis if you call service.
- Keep the model and serial number from the rating plate when ordering parts for F03; Maytag uses multiple revisions with different harness lengths and board firmware.
- Photograph wiring connector orientation before disconnecting any component while troubleshooting F03; reversed plugs on pumps and valves cause immediate repeat faults.