Maytag MEDB765FW0 Thermistor – What It Is, Symptoms & How to Replace It
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Understanding the Problem
Brief explanation: The thermistor in the Maytag MEDB765FW0 is a temperature sensor (an NTC thermistor) the control uses to monitor drum/air temperature and regulate heat cycles. When it fails (open, short, or out of range), the dryer can overheat, underheat, run too long, cut out early, or display error codes. Step-by-step diagnostic and repair steps: 1) Safety first: Unplug the dryer (or turn off power at the breaker). Confirm power is off before you start. Have a multimeter (ohms), screwdriver set, and needle‑nose pliers ready. 2) Access the thermistor: On MED‑series Maytag dryers the thermistor is typically located on or near the blower housing/air duct inside the cabinet (often behind the front panel or rear access panel). Remove the lint screen and screws securing the top/front or rear panel per model layout to get access. Keep panels and screws organized. 3) Locate and visually inspect: Find the thermistor — a small probe with two wires and a plastic mounting grommet or clip. Inspect the wires and connector for burns, pinches, or corrosion. If wiring is damaged, repair the harness or connector. 4) Check continuity/resistance at room temp: Disconnect the thermistor connector. Set the multimeter to measure resistance (ohms). Measure across the two thermistor pins. Note: absolute resistance value varies by part — the important check is that the thermistor is not open (infinite) or shorted (near 0Ω), and that its resistance changes when heated. Record the reading. 5) Verify temperature response: While measuring, apply warm air (hair dryer) to the probe and watch the meter — an NTC thermistor’s resistance should decrease as temperature rises. If resistance stays the same (open or static), the thermistor is faulty. 6) Optional: Compare to spec — if you have the service manual or OEM part spec, compare measured ohms at 20–25°C to the specified value. If out of tolerance, replace. 7) Replace the thermistor: If the thermistor is bad, order the correct OEM part for MEDB765FW0 (see parts section). To replace, unplug power, remove access panel, unplug the thermistor connector, remove the retaining clip/grommet, pull the old sensor from its mount, install the new sensor into the grommet (ensure a snug fit), reconnect the wiring harness, and reassemble panels. 8) Final checks: Restore power and run a test cycle (air-only or timed dry with no laundry). Confirm the dryer heats and cycles normally and that any prior error codes don’t return. Monitor for abnormal heating. How to fix (practical summary): Verify the sensor is not open/shorted and that resistance changes with temperature. If defective or wiring is damaged, remove and replace the thermistor with the OEM replacement, ensuring a secure mechanical and electrical connection. Reassemble and test. Safety note: Always disconnect power before opening the dryer. If you are not comfortable working with electrical appliances, hire a qualified technician.
Common Symptoms
Dryer overheating or underheating, cycles that are too long or too short, dryer won’t reach temperature, or temperature‑related error codes; sometimes dryer stops mid‑cycle.
Common Causes
- Thermistor failed (open, shorted, or drifted out of spec)
- Damaged wiring harness or corroded connector to the thermistor
- Control board misreading due to intermittent thermistor connection or other sensor failures
Popular Parts That Fix This Problem
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Helpful Repair Tip
Quick check: With the thermistor disconnected, measure resistance while blowing warm air over the sensor. If the resistance does not decrease as it warms, the thermistor is bad.
Frequently Asked Questions
How do I know if the thermistor is bad or if it's the control board?
Start by testing the thermistor resistance and its response to temperature. If the thermistor is open/shorted or its resistance does not change when heated, replace it. If the thermistor tests good and wiring/connectors are solid but the dryer still behaves incorrectly, the control board or other temperature safety devices (thermostats, high‑limit) may be at fault—inspect and test those components next or consult a technician.
Can I replace the thermistor myself and how much does it cost?
Yes — replacing the thermistor is a straightforward DIY job if you are comfortable removing panels and using a multimeter. Typical steps: unplug dryer, access sensor, disconnect, remove clip/grommet, swap in new sensor, reassemble. Parts cost generally ranges from $15–$60 depending on supplier and OEM vs aftermarket; labor is minimal if you do it yourself.
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