How to Check Dryer Outlet with Multimeter

Did your dryer work more efficiently than it used to? Are your clothes taking too long to dry? These common issues might be due to your dryer needing the proper electricity. 

Checking the dryer outlet to ensure it delivers the right voltage is crucial in diagnosing and resolving this issue. In this article, we will guide you through the easy steps to check your dryer outlet with a multimeter.

Tools Required to Test a Dryer Outlet

Before you begin, gather the following materials to ensure a safe and accurate measurement:

How to Check Dryer Outlet with Multimeter

Step 1: Safety First

Safety should always be your priority. Start by unplugging the dryer to eliminate any risk of electrical shock. Use your safety gear, gloves, and goggles to protect yourself during testing.

Step 2: Prepare Your Multimeter

Switch on the multimeter. Plug the red (positive) and black (negative) probes into their respective ports on the multimeter.

The red probe typically goes into the port labeled “VΩmA” or similar, and the black probe goes into the “COM” port. Your owner’s manual can provide specific instructions if you’re unsure.

Your dryer operates on Alternating Current (AC), so you must set your multimeter to measure AC voltage. Locate the dial or button to select the current type and set it to AC.

Ensure it’s set to the maximum setting for testing AC currents to prevent overpowering the device.

Step 3: Measure Voltage Between Side Slots

Carefully insert the two probes into the side slots of the dryer’s wall outlet. The red (positive) probe should go into the right slot, and the black (negative) probe should go into the left slot.

Be cautious not to touch the metal tips of the probes to avoid any electrical shock or interference with the reading.

avoid electrical shock with multimeter

With the probes inserted, observe the multimeter’s display. If the outlet functions correctly, it should register 220 and 240 volts. This range is typical for dryer outlets and indicates that it delivers the necessary power to operate efficiently.

Step 4: Measure the Voltage Between the Side and Top/Bottom Slots

With one probe already in one of the side slots from the previous step, carefully insert the other probe into the top slot of the outlet. Be extremely cautious to avoid touching the metal parts of the probes to prevent any electrical shock or short circuit.

Observe the reading on the multimeter once the probes are securely in place. A properly functioning outlet should give a reading of approximately 120 volts.

This reading indicates that the outlet delivers half the total voltage, which is normal in a 220-240 volt dryer outlet.

Step 5: Evaluate the Results

Start by reviewing the readings displayed on the multimeter. Ensure you have noted the readings from both the side slots and the top/bottom slots of the dryer’s outlet.

These readings are crucial in determining the outlet’s performance.

Compare the Readings

For a 220-volt dryer outlet:

  • The voltage between the two side slots should read between 220-240 volts.
  • The voltage from one side slot to the top or bottom slot should be approximately 120 volts.

Analyze the Results

  • Optimal Performance: Your dryer’s outlet is in good condition if the readings align with the expected values.
  • Below Expectation: If the readings are significantly lower, it indicates a potential issue with the outlet’s power supply or wiring.

Identify Potential Issues

  • Voltage Fluctuations: Inconsistent readings or fluctuations in voltage can indicate wiring issues or problems with the power supply.
  • Zero or Low Voltage: If the multimeter reads zero or significantly low voltage, it clearly shows a malfunctioning outlet.

Safety Precautions

  • Do Not Use the Dryer: If abnormal readings are obtained, avoid using the dryer until the issue is resolved to prevent damage to the appliance or potential safety hazards.


Ensuring that your dryer outlet is functioning properly is crucial for the efficiency of your dryer and the safety of your home. Regular checks help identify potential issues early, ensuring your dryer operates optimally and safely.

Follow these easy steps to check the voltage of your dryer’s outlet and ensure it delivers the right amount of power.

Frequently Asked Questions


It’s advisable to check the voltage whenever you notice a significant drop in your dryer’s performance. Regular checks can also be scheduled for your home’s general maintenance.

Can I perform these checks if I’m not an electrician?

Yes, with the proper safety precautions and by following the steps outlined, you can safely check the voltage of your dryer’s outlet.


If the readings indicate that the outlet isn’t functioning properly, it’s best to contact a professional electrician for a detailed inspection and necessary repairs.

Alex Klein Author


Alex Klein is an electrical engineer with more than 15 years of expertise. He is the host of the Electro University YouTube channel, which has thousands of subscribers.