Dryer Not Heating — Diagnostic Guide

Run the dryer for 5 minutes on a regular heat cycle. Confirm the drum is rotating and you can hear airflow, but the exhaust air at the back is cool or only slightly warm. This rules out a dead motor, door switch failure, or start capacitor issue — all of which would stop the drum as well.

• Drum not spinning at all: This is a belt, motor, or door switch problem — not a heating issue. Diagnose those separately.
• Drum spinning, no heat at all: Thermal fuse, heating element (electric), or igniter/sensor (gas). Proceed to Step 2.
• Drum spinning, some heat but clothes still damp after a full cycle: Likely a clogged vent or a cycling thermostat failing intermittently. Proceed to Step 4.

The thermal fuse is the first component to check on any electric dryer with a no-heat complaint. It is located on the exhaust duct inside the back panel — a small white or silver rectangular component with two wire leads.

• Unplug the dryer. Remove the back panel (typically 4–8 screws). Locate the thermal fuse on the exhaust duct near the blower outlet.
• Disconnect the wire leads from both terminals of the fuse.
• Set a multimeter to resistance (Ohms) or continuity mode. Touch one probe to each terminal. A working fuse reads 0 Ohms (or beeps in continuity mode). A blown fuse reads OL (open circuit).
• If blown: Replace the fuse. Manufacturer-specific thermal fuses for Whirlpool, Maytag, Kenmore, GE, LG, and Samsung are all available online for $5–20. Reinstall is the reverse of removal — two wire leads and two mounting screws.
• Critical: A blown thermal fuse is a symptom, not the root cause. Before reassembling, proceed to Step 4 to clear the exhaust vent. A new fuse installed in a still-clogged dryer will blow again in short order.

If the thermal fuse tests good but the dryer still produces no heat, the heating element is the next suspect. On most electric dryers, the element is accessible from the back panel or by removing the front panel — it’s a coiled wire inside a metal housing.

• Locate the element housing: On Whirlpool and Maytag top-load dryers, it’s typically at the back panel near the drum. On Samsung and LG front-loaders, it’s usually accessed from the back or bottom. Check your model’s service manual for exact location.
• Disconnect both wire leads to the element terminals.
• Test for continuity: Set your multimeter to Ohms. Touch probes to both terminals. A working element reads 8–50 Ohms (varies by wattage rating). An open circuit (OL) reading means the element is broken and needs replacement.
• Also inspect visually: Look for a visible break in the coil, burned spots on the housing, or scorch marks. A burned element is obvious to the eye.
• Replace if failed: Replacement elements for Whirlpool, GE, Samsung, LG, Maytag, and Kenmore are widely available. Match by model number. Most are held in with 2–4 screws and swap out in 30–60 minutes.

This step is mandatory regardless of which component failed. A clogged vent is the root cause of most dryer no-heat calls — it triggers thermal fuse failure, accelerates element burnout, and is a leading cause of home fires. Clean it every time you open the dryer for service.

• Clean the lint screen: Remove the lint trap and wash the screen with warm water and dish soap. Fabric softener sheets coat the mesh with an invisible film that blocks airflow over time. Let it dry completely before reinstalling.
• Check airflow at the exhaust port: Disconnect the flexible duct from the back of the dryer and run the dryer for 30 seconds. You should feel strong warm airflow from the dryer’s exhaust port. Weak or no airflow from the dryer itself points to a clogged blower wheel inside the cabinet.
• Clean the exhaust duct run: Use a dryer vent cleaning brush kit (available for $20–40 at hardware stores) to push lint out of the duct from the dryer end. Go outside and find the exterior vent cap — clear any lint buildup from the flap and the cap opening.
• Check for duct damage or improper installation: Foil flex duct should be replaced with smooth rigid metal duct where possible. Flex duct that is kinked, crushed, or more than 8 feet long significantly restricts airflow. Check that the run terminates outside the building — not into a crawl space or attic.
• Confirm airflow: Reconnect the duct and run the dryer. Stand outside and confirm strong airflow and heat exhausting from the vent cap.

On gas dryers, the heating sequence is: igniter glows → radiant flame sensor detects glow and opens gas valve → gas flows and ignites → burner flame heats the drum. Either the igniter or the radiant sensor can fail and prevent ignition entirely.

• Watch through the access panel: Open the lower panel of the gas dryer and start a heat cycle. The igniter (a fragile ceramic glow-bar element) should glow orange within 30–60 seconds. If you see a glow but no flame ignites, the radiant sensor or gas valve coils have failed. If there is no glow at all, the igniter itself is failed.
• Test the igniter for continuity: Unplug the dryer and disconnect the igniter leads. Test with a multimeter — the igniter should show 50–400 Ohms of resistance. An OL reading means the igniter element has burned out.
• Gas valve coils: The gas valve has a set of solenoid coils that open the valve in response to the radiant sensor. These coils also fail. Replacement coil kits are available for most gas dryer brands at $10–30.
• Replacement igniter cost: $15–40 for most brands. Igniters are fragile — handle with care and do not touch the glow element with bare hands (oils from skin can cause premature failure).

If thermal fuse, heating element, and vent are all confirmed good, the cycling thermostat or high-limit thermostat is likely failed open. These are bimetal switches that regulate heat — a thermostat that has failed open cuts power to the element continuously, producing the same symptom as a blown fuse.

• Location: Both thermostats are typically mounted on the exhaust duct or the heating element housing. They are small disc or oval-shaped components with two wire leads, similar in appearance to the thermal fuse.
• Test for continuity: Disconnect both leads. Test with a multimeter in continuity or resistance mode. At room temperature, a working thermostat reads continuity (0 Ohms). An open reading (OL) at room temperature means it has failed open and is not conducting.
• Replacement: Cycling thermostats cost $10–25 and are available for all major brands. Since they fail from the same cause as the thermal fuse (chronic overheating from a restricted vent), it is good practice to replace the thermal fuse and both thermostats together when any one of them has failed — thermostat kits are available bundled at $15–35.

If all heating components test good and airflow is confirmed clear, the control board may have a failed relay that controls the heating circuit. This is the last-resort diagnosis for electronic dryers with digital controls (Samsung, LG, newer Whirlpool models).

• Look for visible board damage: Remove the control board access panel and inspect for burned relay contacts, scorch marks, or swollen capacitors. A visibly burned relay is diagnostic on its own.
• Check error codes: Many modern dryers will display a fault code on the control panel when a board or sensor fault is detected. Consult the model’s service manual for error code definitions.
• Control board replacement cost: $80–250 depending on the brand and model. At this cost, factor in unit age and total repair cost vs. replacement.
• Replacement threshold: If the total repair cost (parts + labor if not DIY) exceeds $200 and the dryer is over 8–10 years old, replacement is often the better economic decision. A new mid-range electric dryer runs $400–700 installed; a gas dryer runs $450–750.