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Fix a hair straightener that will not heat

We'll confirm the indicator works, rule out power and settings, then isolate the cause—heating element, thermal fuse, or cord—or tell you when to call a pro.

Troubleshooting · Home appliances
15–30 min
What you'll need
  • Multimeter (for continuity tests)
  • Screwdriver set (Phillips and flathead)
  • Replacement thermal fuse or heating element (if tests show a fault)
Step 1 of 8

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Steps

Goal: Confirm the symptom, rule out power and settings, then isolate the heating fault.

  • Turn the hair straightener on and set a temperature. Confirm the indicator light turns on. Wait two minutes—the plates should warm.
  • Good: The indicator is on but the plates stay cold—heating system has failed. Proceed to Check power and settings.
  • Bad: The indicator does not turn on—different problem (power, cord). See When to get help.

Check power and settings

Goal: Rule out power loss and incorrect settings before opening the straightener.

  • Verify the straightener is plugged in and the circuit breaker has not tripped. Reset the breaker if tripped.
  • Confirm the temperature setting is on (low, medium, or high)—not off or at the lowest setting.
  • Test the outlet with another device. If the outlet does not work, fix the outlet or use a different circuit.
  • Good: Power is on, temperature setting is engaged. Proceed to Heating path.
  • Bad: Breaker keeps tripping or outlet is dead—fix those first.

Heating path

Goal: Test and replace the thermal fuse or heating element.

  • Unplug the hair straightener. Open the housing per your model. Check your owner’s manual or search “[brand] [model] hair straightener service manual” for disassembly steps if unsure.
  • Locate the thermal fuse (small cylinder). Test for continuity with a multimeter. No continuity means it has blown—replace with an exact match.
  • Locate the heating element (wire or ribbon inside the plates). Test for continuity. Replace if broken or burned.
  • Good: You found and replaced the faulty part. Reassemble and test—the straightener should heat.
  • Bad: All parts test good but the straightener still does not heat—call a pro.

When to get help

Call an appliance technician if:

  • The indicator does not turn on (power or cord issue—different problem).
  • You have replaced the thermal fuse and heating element and the straightener still does not heat.
  • You are not comfortable working with electrical components.

Hair straighteners under $40 are often cheaper to replace than repair.

Verification

  • The indicator turns on and the plates are warm within two minutes.
  • No burning smell or unusual behavior.
  • The thermal fuse and heating element (if replaced) test good and the straightener heats consistently.

Escalation ladder

Work from the device outward. Stop when the problem is fixed.

  1. Confirm symptom Verify the straightener powers on but the plates stay cold; rule out a different problem.
  2. Power and settings Check circuit breaker and temperature setting.
  3. Thermal fuse and heating element Test and replace thermal fuse or heating element if faulty.
  4. Call a pro Part replacement did not fix it—call an appliance technician.

What to capture if you need help

Before calling support or posting for help, have these ready. It speeds everything up.

  • Whether the indicator light turns on
  • Whether the temperature setting is engaged
  • Thermal fuse / heating element test results
  • Steps already tried

Does the straightener power on but the plates stay cold?

Turn the straightener on and wait two minutes. If the indicator is on but the plates stay cold, the heating system has failed.

Turn the straightener on. Set a temperature. Wait two minutes. Good: indicator on but plates cold—heating fault. Bad: indicator does not turn on—power or cord issue.

Yes No

You can change your answer later.

Is power on and the temperature setting engaged?

Circuit breaker and temperature setting can prevent heat.

Verify the straightener is plugged in and the circuit breaker has not tripped. Confirm the temperature setting is on (not off or lowest). Good: power on, temperature on. Bad: breaker tripped—fix first.

Yes No

You can change your answer later.

Does the thermal fuse have continuity?

The thermal fuse is a small cylinder. Test with a multimeter.

Unplug the straightener. Open the housing per your model. Locate the thermal fuse. Test for continuity. No continuity: fuse blown—replace with exact match, reassemble, test. Continuity: fuse good—proceed to heating element.

Yes (good) No (blown)

You can change your answer later.

Replace thermal fuse and test

Replace the thermal fuse with an exact match. Reassemble and test. The straightener should heat if the fuse was the only fault. If it still does not heat, proceed to check the heating element.

Done

Does the heating element have continuity?

The heating element is wire or ribbon inside the plates. Test with a multimeter.

Locate the heating element. Test for continuity. If no continuity or visible breaks or burn marks, replace it. Good: replaced or element good—straightener should heat. Bad: all parts good but still no heat—call a pro.

Yes (good) No (broken)

You can change your answer later.

Replace heating element and test

Replace the heating element with a matching part. Reassemble and test. The straightener should heat. If it still does not heat, call a pro.

Done

Test the straightener

Reassemble and test. If the thermal fuse and heating element test good, the temperature control may be faulty. If the straightener heats, the fix worked. If not, call a pro.

Done

Call a technician

Call an appliance technician if: the indicator does not turn on (power or cord issue); you have replaced the thermal fuse and heating element and it still does not heat; or you are not comfortable working with electrical components. Straighteners under $40 are often cheaper to replace than repair.

Done

Reviewed by Blackbox Atlas

Frequently asked questions

Why would a hair straightener run but not heat?
Common causes: a failed heating element, blown thermal fuse, or faulty temperature control. The thermal fuse blows when the straightener overheats. Check power and temperature setting first, then test the heating element and thermal fuse.
Can I fix a hair straightener that will not heat myself?
Yes, if you are comfortable with basic electrical work. Unplug the straightener before any repair. Open the housing per your model—check your owner's manual or search "[brand] [model] hair straightener service manual" for disassembly steps. Test the heating element and thermal fuse for continuity. Replace faulty parts with exact matches. Straighteners under $40 are often cheaper to replace than repair.
When should I call a technician for a hair straightener that will not heat?
Call an appliance technician if you have replaced the heating element and thermal fuse and it still does not heat, or if you are not comfortable working with electrical components. Many hair straighteners cost under $40—if repair cost exceeds that, replacing the unit may make more sense.

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