Testing a dryer thermal fuse is the fastest way to confirm whether it has failed.
The process takes about 10–15 minutes and requires a basic multimeter.
For a complete overview of thermal fuse symptoms and replacement, see Dryer Thermal Fuse: Complete Guide (Symptoms, Testing & Replacement).
Tools You Need
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Multimeter (digital or analog)
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Screwdriver (usually Phillips or 1/4-inch nut driver)
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Work gloves (optional)
Step 1: Disconnect Power
Unplug the dryer from the wall outlet.
If the dryer is hardwired, turn off the breaker at the electrical panel.
Never test components while the dryer is connected to power.
Step 2: Access the Thermal Fuse
In most dryers, the thermal fuse is located on the blower housing or exhaust duct.
Rear-access dryers require removing the back panel.
Some front-access models require removing the lower front panel.
The fuse is typically a small white plastic piece with two wires connected to it.
Step 3: Remove the Wires
Carefully pull the two wires off the fuse terminals.
Grip the connector, not the wire itself, to avoid damage.
Step 4: Set the Multimeter
Turn the multimeter dial to:
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Continuity mode (if available), or
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The lowest ohms (Ω) resistance setting
If using continuity mode, the meter will beep when a complete circuit is detected.
Step 5: Test the Fuse
Touch one probe to each terminal of the thermal fuse.
Results:
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If the meter shows continuity (or near 0 ohms), the fuse is good.
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If the meter shows OL, infinite resistance, or no beep, the fuse is blown.
A blown fuse must be replaced.
What If the Fuse Tests Good?
If the fuse has continuity, the problem is likely elsewhere.
Possible causes include:
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Faulty thermostat
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Failed heating element
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Broken door switch
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Control board issue
Further diagnosis may be required.
Important Reminder
If the fuse is blown, inspect the vent system before installing a new one.
Common airflow issues include:
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Lint buildup in vent hose
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Crushed duct behind dryer
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Blocked exterior vent hood
Fixing airflow problems helps prevent repeat failures.