Why Is My Curling Iron Not Getting Hot? 5 Fixes & Causes

The short answer: Your curling iron may not get hot enough due to a faulty heating element, thermostat issues, voltage problems, or a buildup of hair products and debris. Try cleaning the plates, checking the cord and outlet, and resetting the iron before replacing it.

1. Check the Obvious: Power and Cord Issues

Before you blame the heating element, verify that the iron is receiving full power. A loose connection in the cord or a damaged plug can cause intermittent heating or a drop in temperature.

• Inspect the cord: Look for frays, kinks, or exposed wires. If the cord is damaged, stop using the iron immediately as it’s a fire hazard.
• Test another outlet: Some outlets, especially in older homes, may not supply the full voltage. Try a different outlet in another room, preferably one on a different circuit.
• Look for a reset button: Many curling irons have a small reset button near the plug or on the handle. Press it and see if that restores heating.

If the iron heats up but not to the desired temperature, and the cord is intact, it’s likely an internal issue.

2. Clean the Heating Plates and Vents

Product buildup (hairspray, gels, oils) and dust can insulate the plates, preventing heat from transferring to your hair and also causing the iron to overheat internally and shut off early. This is one of the most common reasons for a curling iron not getting hot enough.

How to clean:

1. Unplug the iron and let it cool completely.
2. Dampen a cotton ball or soft cloth with rubbing alcohol (isopropyl).
3. Wipe the plates thoroughly, focusing on any sticky residue. Do not submerge the iron in water.
4. Use a dry cloth to wipe off any residue.
5. Check the vents (usually at the base or sides) and clear any hair or lint with a toothpick or tweezers.

Do this once a month if you use styling products regularly.

3. Reset the Thermostat or Heating Element

If cleaning doesn’t help, the internal thermostat may be stuck or miscalibrated. Many irons have an automatic shutoff that triggers if the iron gets too hot internally, but sometimes it trips prematurely.

How to reset:

• Unplug the iron and let it cool for at least 30 minutes.
• Plug it back in and set it to the highest temperature.
• Watch if it heats up normally. If it doesn’t, there might be a manual reset hole (use a paperclip) or a reset button on the handle. Consult your manual.

If the thermostat is truly defective, you might notice the iron heats up but never reaches the set temperature, or it fluctuates wildly. In that case, you’ll need to replace the iron or have it serviced by a professional (often not worth the cost).

4. Understand Voltage and Wattage Limitations

Curling irons are designed to operate on a specific voltage (usually 110-120V in the US). If you’re using a dual-voltage iron abroad, you may need to switch the voltage setting. If you’re not switching it, the iron may heat up too slowly or not enough.

• Check the label on the iron for voltage information. Some irons have a switch for 110V/220V.
• If you’re using a voltage converter, it might not supply enough wattage (most irons require 1000+ watts). A low-wattage converter can cause underheating.
• Also, avoid using a power strip or extension cord that is overloaded, as it can reduce current flow.

If you’re at home and using the correct outlet, move on to the next fix.

5. Consider the Age and Quality of Your Curling Iron

Heating elements degrade over time. If your iron is more than 2-3 years old and used frequently, it may simply be worn out. Cheaper irons often have thinner heating elements that burn out faster.

Signs of an aging iron:

• It takes longer to heat up than when it was new.
• It heats unevenly (hot spots or cold spots).
• It shuts off by itself randomly.

If you’ve tried everything and the iron still underperforms, it’s probably time for a new one. For a curated list of reliable models, check out our 10 Best Curling Irons 2026: Top Wands & Irons for Every Curl Type to find one with consistent temperature control and durability.

Frequently Asked Questions

Q: Can I fix a curling iron that doesn’t heat up at all? A: If it doesn’t heat at all, check the power source first. If the cord is fine, the heating element or fuse is likely blown. Most irons have an internal fuse that can’t be replaced easily, so it’s often simpler to buy a new one. However, you can open it (carefully) and test the heating element with a multimeter if you’re handy.

Q: Why does my curling iron heat up then stop? A: This is usually a thermostat issue or an automatic shutoff feature. If the iron overheats internally, it will shut off to prevent fire. Clean the vents and ensure you’re not blocking airflow. If it persists, the thermostat may need replacement.

Q: Is it safe to use a curling iron with a damaged cord? A: No, never use a curling iron with a frayed or damaged cord. It can cause electric shock or start a fire. Replace the iron or have it repaired by a professional, but it’s often more cost-effective to replace.

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