Maytag · Dryer
Maytag Dryer F03 Error Code
Exhaust thermistor open circuit
What this error means
F03 means the exhaust thermistor sent an open-circuit reading. The control cannot modulate heat safely without exhaust temperature feedback and may shut off the burner or element.
How F03 is detected
When F03 appears on a Maytag dryer, the control board has confirmed that water did not leave the machine within the programmed drain window. On Maytag MEDB855DC, Maytag MED6230HW, 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: unplug and reseat the thermistor plug on the blower outlet. 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
- Two-wire thermistor connector loose at the blower housing
- Broken wire in the harness near the drum bulkhead
- Failed thermistor element internally open
- Heavy lint shorting the sensor connector
Step-by-step fixes
- 1Unplug and reseat the thermistor plug on the blower outlet
- 2Vacuum lint from the connector area
- 3Measure thermistor resistance against the service chart at room temperature
- 4Run a timed cycle on low heat after wiring is verified
When to call a technician
Open thermistor at room temp with intact wiring requires sensor or harness replacement.
Affected models
- Maytag MEDB855DC
- Maytag MED6230HW
- Maytag MGDC465HW
Prevention & maintenance
- Clean drain filters and hose terminations monthly on high-use dryers 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 dryer—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.