MEDC300BW0 Dryer Not Heating – What Part Fixes This Problem?
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Understanding the Problem
If your MEDC300BW0 electric dryer runs (drum turns and motor runs) but does not heat, the problem is usually one or more failed heating components or a power-supply issue. Below are likely causes and step-by-step diagnostics and repair instructions you can follow. Always unplug the dryer or switch off the home's breaker before working on it. 1) Verify basic power: Electric dryers need two 120V legs (240V). With the dryer running and clothes in it, use a multimeter to check voltage at the terminal block — you should read ~240V across the two hot terminals. If you only read ~120V or one leg is missing, troubleshoot the wall outlet, dryer cord, or house breaker first. 2) Check for airflow blockages: Restricted venting can make the dryer seem like it isn't heating or cause it to overheat and trip safety parts. Disconnect the vent and run the dryer empty for 1–2 minutes; if it dries faster with vent disconnected (not recommended long-term), clean the vent/duct. Also check the lint screen and inside the cabinet for lint build-up. 3) Test the thermal fuse (most common failure): The thermal fuse is a one-time safety device that blows when the dryer overheats. Locate it (usually on the blower housing or exhaust duct). With power off and the fuse removed, check continuity with a multimeter. If the fuse has no continuity, replace it. Note: a blown thermal fuse often indicates an airflow/venting problem — fix that before replacing the fuse. 4) Test the heating element: Remove the rear panel (or access panel per your model) and inspect the heating coil for breaks or visible damage. Check continuity across the heater terminals — you should see low resistance (typically a few ohms). Open or infinite resistance means the element is bad and needs replacement. Also inspect the element mounting for shorting to the cabinet — grounding to the cabinet can trip thermostats/fuse. 5) Test thermostats/thermal cutoffs: There are usually one or two thermostats (cycling thermostat and high-limit or cutoff). With power off, remove the thermostat leads and test for continuity (cold). A thermostat with no continuity at room temperature is bad and must be replaced. If the high-limit trips intermittently, replace it and correct airflow issues. 6) Check the timer, selector switch, or control board heater relay: If the element, fuse, and thermostats are good but the element never receives voltage, the fault may be at the timer contacts, console timer, or electronic control/relay. With the dryer running on a timed heat cycle, measure voltage at the heating element terminals. If there is no 240V to the element but the supply to the dryer is 240V, the control is not sending power and the timer/board/relay or wiring is suspect. Inspect wiring and switches for burned contacts. 7) Inspect door switch and start switch only if dryer won't start: For a unit that does not spin or start, check the door switch, start switch, and motor circuit. (Not the primary focus when dryer runs but doesn't heat.) 8) Replace parts and re-test: Replace any failed part, reassemble, restore power, and run a test cycle with an empty load. Confirm that the dryer now heats and that airflow is normal. Re-check venting to ensure long-term reliability. Repair notes (practical how-to): - Always disconnect power at the breaker and verify power is off before opening the cabinet. Use proper tools and keep track of screws and wire locations (photograph wiring before disconnecting). - Replace the thermal fuse and thermostats in sets when they look worn or when you are already servicing the heater assembly. - If replacing the heating element, carefully remove it from the housing, avoid bending the coil, and ensure the new element is seated and the element housing gasket is intact. - After replacement, run the dryer empty for several minutes and check exhaust temperature and airflow to confirm the issue is resolved. Safety note: Working on dryers involves hazardous voltages and hot components. If you are not comfortable with electrical diagnosis or have no multimeter experience, hire a qualified technician.
Common Symptoms
Dryer runs (drum turns) but clothes remain damp; dryer heats briefly then stops; dryer trips house breaker; very long dry times; unusual burning smell (indicates airflow restriction or failed element).
Common Causes
- Blown thermal fuse from overheating (often caused by restricted venting)
- Open or shorted heating element/coils
- Failed cycling thermostat or high-limit thermostat/thermal cutoff
- No 240V supply to the dryer (missing leg at outlet or bad cord/breaker)
- Faulty timer, selector switch or electronic control/relay that does not send power to the element
Popular Parts That Fix This Problem
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Helpful Repair Tip
Start by checking the thermal fuse for continuity — it’s inexpensive and the most common reason for a MEDC300BW0 to run but not heat. If the fuse is blown, also clean the exhaust and lint path before installing a new fuse.
Frequently Asked Questions
How do I test the thermal fuse on my MEDC300BW0 dryer?
Unplug the dryer and access the thermal fuse (usually on the blower housing or exhaust duct). Disconnect the fuse from the wiring, set a multimeter to continuity or lowest ohms scale, and check between the two terminals. A good fuse will show near-zero resistance or continuity. If it reads open (OL), the fuse is blown and must be replaced. Remember to correct any venting problems that caused the fuse to blow before installing a new one.
Can I replace the heating element myself and how long does it take?
Yes — if you are comfortable with basic hand tools and have turned off power at the breaker. Typical steps: unplug dryer, remove rear or front access panel per your model, disconnect element wiring and remove mounting screws, pull out old element and install new one, reconnect wires, reassemble panels, restore power and test. Expect 30–90 minutes depending on experience and access to the element. If the cause was airflow restriction, clean the venting before returning the dryer to regular use.
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