{"id":14316,"date":"2025-03-21T07:35:34","date_gmt":"2025-03-21T14:35:34","guid":{"rendered":"https:\/\/www.appliancepartspros.com\/b\/?p=14316"},"modified":"2026-07-14T10:54:23","modified_gmt":"2026-07-14T17:54:23","slug":"ac-vs-dc-voltage-and-how-to-test-both-with-a-multimeter","status":"publish","type":"post","link":"https:\/\/www.appliancepartspros.com\/b\/ac-vs-dc-voltage-and-how-to-test-both-with-a-multimeter\/","title":{"rendered":"AC vs DC voltage and how to test both with a multimeter"},"content":{"rendered":"","protected":false},"excerpt":{"rendered":"<p>Learn how to test both AC and DC voltage with your multimeter to ensure your electrical systems are running smoothly.<\/p>\n","protected":false},"author":3,"featured_media":14701,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"_yoast_wpseo_focuskw":"AC vs DC voltage testing with a multimeter","_yoast_wpseo_title":"%%title%% %%page%%","_yoast_wpseo_metadesc":"Learn how to test both AC and DC voltage with your multimeter to ensure your electrical systems are running smoothly.","_aviaLayoutBuilderCleanData":"[av_image src='https:\/\/www.appliancepartspros.com\/b\/wp-content\/uploads\/2025\/02\/Updated-blog-rectangle-1-3.jpg' attachment='14700' attachment_size='full' copyright='' caption='' styling='' align='center' font_size='' overlay_opacity='0.4' overlay_color='#000000' overlay_text_color='#ffffff' animation='no-animation' hover='' appearance='' link='' target='' title_attr='' alt_attr='' lazy_loading='disabled' id='' custom_class='' av_element_hidden_in_editor='0' av_uid='av-1b37tsc' admin_preview_bg=''][\/av_image]\r\n\r\n[av_textblock size='' av-medium-font-size='' av-small-font-size='' av-mini-font-size='' font_color='' color='' id='' custom_class='' av_uid='av-m79e1f74' admin_preview_bg='']\r\n<span style=\"font-weight: 400;\">When your appliance stops working, the first instinct might be to start replacing parts. However, before spending money you don\u2019t need to, it\u2019s better to test the electrical parts to confirm which one is bad. Whether you\u2019re dealing with a dead heating element, a non-responsive control board, or a faulty power cord, checking voltage is an essential troubleshooting step. Many appliance issues come down to a power problem, and using a multimeter to check for voltage is a simple way to diagnose the issue.<\/span>\n\nWe recommend consulting your manufacturer's documentation or<\/span><a href=\"https:\/\/www.appliancepartspros.com\/repair-help\/\"><span style=\"font-weight: 400;\"> contact us<\/span><\/a><span style=\"font-weight: 400;\"> with any questions.<\/span><\/em>\r\n\r\n[lwptoc numeration=\"none\"]\r\n<h2><span style=\"font-weight: 400;\">Understanding AC and DC voltage in appliances<\/span><\/h2>\r\n<span style=\"font-weight: 400;\">All appliances need voltage to run but different parts can rely on either AC (alternating current) or DC (direct current) voltage, depending on their role. Since appliances may use both types of voltage, knowing where and how to measure each type is important when troubleshooting.\u00a0<\/span>\r\n\r\n<b>AC voltage (alternating current)<\/b>\r\n<ul>\r\n \t<li style=\"font-weight: 400;\" aria-level=\"1\"><span style=\"font-weight: 400;\">AC power flows in both directions, switching back and forth in cycles.<\/span><\/li>\r\n \t<li style=\"font-weight: 400;\" aria-level=\"1\"><span style=\"font-weight: 400;\">This is the type of electricity supplied by your home\u2019s wall outlets.<\/span><\/li>\r\n \t<li style=\"font-weight: 400;\" aria-level=\"1\"><span style=\"font-weight: 400;\">Most large appliances such as ovens, dryers, refrigerators, and washing machines use AC voltage for their main power supply.<\/span><\/li>\r\n \t<li style=\"font-weight: 400;\" aria-level=\"1\"><span style=\"font-weight: 400;\">parts like heating elements, motors, and compressors typically run on AC.<\/span><\/li>\r\n<\/ul>\r\n<b>DC voltage (direct current)<\/b>\r\n<ul>\r\n \t<li style=\"font-weight: 400;\" aria-level=\"1\"><span style=\"font-weight: 400;\">DC power flows in only one direction, maintaining a steady voltage level.<\/span><\/li>\r\n \t<li style=\"font-weight: 400;\" aria-level=\"1\"><span style=\"font-weight: 400;\">Found in battery-powered devices, electronic circuits, and appliance control boards.<\/span><\/li>\r\n \t<li style=\"font-weight: 400;\" aria-level=\"1\"><span style=\"font-weight: 400;\">Many modern appliances convert AC to DC internally to power electronic parts like digital displays, touch controls, and inverter compressors.<\/span><\/li>\r\n \t<li style=\"font-weight: 400;\" aria-level=\"1\"><span style=\"font-weight: 400;\">If an appliance has a control board, it likely uses DC voltage for some of its operations.<\/span><\/li>\r\n<\/ul>\r\n<h2><span style=\"font-weight: 400;\">Why testing voltage matters in appliance repair<\/span><\/h2>\r\n<span style=\"font-weight: 400;\">Using a multimeter to check voltage can save time and money when troubleshooting an appliance. Instead of guessing which part might be faulty, you can confirm whether a part is receiving power and functioning correctly before replacing it. By testing voltage before replacing parts, you can quickly determine whether an issue is electrical or mechanical. If you confirm a part is faulty, <\/span><a href=\"http:\/\/appliancepartspros.com\"><b>AppliancePartsPros.com<\/b><\/a><span style=\"font-weight: 400;\"> can help you find the right OEM replacement.<\/span>\r\n<h3><span style=\"font-weight: 400;\">The benefits of testing\u00a0<\/span><\/h3>\r\n<ul>\r\n \t<li style=\"font-weight: 400;\" aria-level=\"1\"><span style=\"font-weight: 400;\">Avoids unnecessary part replacements. Sometimes, an appliance issue isn\u2019t caused by a failed part but by a power supply problem. Testing first allows you to replace only what\u2019s truly broken.<\/span><\/li>\r\n \t<li style=\"font-weight: 400;\" aria-level=\"1\"><span style=\"font-weight: 400;\">Identifies power supply issues. Checking the voltage at the outlet, power cord, or control board helps determine if the problem is with the appliance itself or if you need to call an electrician.<\/span><\/li>\r\n \t<li style=\"font-weight: 400;\" aria-level=\"1\"><span style=\"font-weight: 400;\">Saves time on troubleshooting. Instead of trial-and-error part replacements, testing voltage gives a clear answer about where the problem lies.<\/span><\/li>\r\n<\/ul>\r\n<h2><span style=\"font-weight: 400;\">Using a multimeter: getting started<\/span><\/h2>\r\n<span style=\"font-weight: 400;\">There are two main types of multimeters. For appliance repair, a digital multimeter is recommended because it provides quick, clear readings. Analog multimeters with a needle gauge can work well but can be harder to read for precise voltage measurements.<\/span>\r\n\r\n<span style=\"font-weight: 400;\">Most multimeters have separate settings for AC and DC voltage:<\/span>\r\n<ul>\r\n \t<li style=\"font-weight: 400;\" aria-level=\"1\"><b>AC voltage (V~ or VAC)<\/b><span style=\"font-weight: 400;\"> \u2013 used for checking power outlets, power cords, and appliance motors.<\/span><\/li>\r\n \t<li style=\"font-weight: 400;\" aria-level=\"1\"><b>DC voltage (V\u2393 or VDC)<\/b><span style=\"font-weight: 400;\"> \u2013 used for testing control boards, touch panels, and battery-powered parts.<\/span><\/li>\r\n \t<li style=\"font-weight: 400;\" aria-level=\"1\"><b>Continuity mode (\u03a9)<\/b><span style=\"font-weight: 400;\"> \u2013 used to check if a circuit is complete, often for testing fuses and heating elements.<\/span><\/li>\r\n<\/ul>\r\n<span style=\"font-weight: 400;\">Before testing any appliance, follow these safety guidelines:<\/span>\r\n<ul>\r\n \t<li style=\"font-weight: 400;\" aria-level=\"1\"><span style=\"font-weight: 400;\">Always unplug the appliance before testing internal parts.<\/span><\/li>\r\n \t<li style=\"font-weight: 400;\" aria-level=\"1\"><span style=\"font-weight: 400;\">Set the multimeter correctly. Using the wrong setting can cause inaccurate readings or damage the meter.<\/span><\/li>\r\n \t<li style=\"font-weight: 400;\" aria-level=\"1\"><span style=\"font-weight: 400;\">Hold probes by the insulated handles. Avoid touching metal probe tips while testing.<\/span><\/li>\r\n \t<li style=\"font-weight: 400;\" aria-level=\"1\"><span style=\"font-weight: 400;\">Test power at safe points. Avoid exposed wiring and only test at terminals designed for voltage testing.<\/span><\/li>\r\n<\/ul>\r\n<h2><span style=\"font-weight: 400;\">How to test AC voltage in appliance parts<\/span><\/h2>\r\n<span style=\"font-weight: 400;\">Many major appliances run on AC voltage, including ovens, dryers, refrigerators, and washing machines. Testing AC voltage with a multimeter can help determine if power is reaching an appliance or a specific part.<\/span>\r\n<h3><span style=\"font-weight: 400;\">Set up the multimeter for AC voltage<\/span><\/h3>\r\n<ol>\r\n \t<li style=\"font-weight: 400;\" aria-level=\"1\"><span style=\"font-weight: 400;\">Turn the dial to AC voltage (V~ or VAC). Some multimeters have multiple AC ranges, so if you're unsure, start with the highest setting and work down.<\/span><\/li>\r\n \t<li style=\"font-weight: 400;\" aria-level=\"1\"><span style=\"font-weight: 400;\">Insert the probes into the correct ports. The black probe goes into the COM (common) port, and the red probe goes into the V (voltage) port.<\/span><\/li>\r\n \t<li style=\"font-weight: 400;\" aria-level=\"1\"><span style=\"font-weight: 400;\">Confirm the expected voltage range. Most household appliances run on 120V or 240V AC, depending on the device.<\/span><\/li>\r\n<\/ol>\r\n<h3><span style=\"font-weight: 400;\">Test a power outlet or appliance cord<\/span><\/h3>\r\n<span style=\"font-weight: 400;\">To check if an appliance is getting power from the wall outlet or power cord:<\/span>\r\n<ol>\r\n \t<li style=\"font-weight: 400;\" aria-level=\"1\"><span style=\"font-weight: 400;\">Insert the black probe into the neutral slot of the outlet or touch the neutral wire of the cord.<\/span><\/li>\r\n \t<li style=\"font-weight: 400;\" aria-level=\"1\"><span style=\"font-weight: 400;\">Insert the red probe into the hot slot of the outlet or touch the hot wire of the cord.<\/span><\/li>\r\n \t<li style=\"font-weight: 400;\" aria-level=\"1\"><span style=\"font-weight: 400;\">Read the voltage on the display. A standard U.S. outlet should read about 120V, while larger appliances like dryers and ovens may use 240V.<\/span><\/li>\r\n \t<li style=\"font-weight: 400;\" aria-level=\"1\"><span style=\"font-weight: 400;\">If the reading is significantly lower than expected or zero, the outlet or power cord may be faulty.<\/span><\/li>\r\n<\/ol>\r\n<b>Important:<\/b><span style=\"font-weight: 400;\"> when testing inside an appliance, only test live voltage if necessary and comfortable doing so. If possible, unplug the appliance and test continuity instead.<\/span>\r\n<h2><span style=\"font-weight: 400;\">How to test DC voltage in appliance parts<\/span><\/h2>\r\n<span style=\"font-weight: 400;\">Many modern appliances use DC voltage for control boards, touch panels, and electronic parts. Since these parts often receive power from an AC-to-DC converter, testing DC voltage can help determine if an issue is with the power supply or the part itself.<\/span>\r\n<h3><span style=\"font-weight: 400;\">Setting up the multimeter for DC voltage<\/span><\/h3>\r\n<ol>\r\n \t<li style=\"font-weight: 400;\" aria-level=\"1\"><span style=\"font-weight: 400;\">Turn the dial to DC voltage (V\u2393 or VDC) . Some multimeters have multiple ranges, so start with the highest if unsure.<\/span><\/li>\r\n \t<li style=\"font-weight: 400;\" aria-level=\"1\"><span style=\"font-weight: 400;\">Insert the probes into the correct ports. The black probe goes into the COM (common) port, and the red probe goes into the V (voltage) port.<\/span><\/li>\r\n \t<li style=\"font-weight: 400;\" aria-level=\"1\"><span style=\"font-weight: 400;\">Identify the expected voltage range. Common DC voltage levels in appliances include 5V or 12V for control boards and electronic displays, 24V for some appliance relays and actuators and variable DC voltage in inverter compressors and advanced motor systems.<\/span><\/li>\r\n<\/ol>\r\n<h3><span style=\"font-weight: 400;\">Testing DC voltage in control boards and circuits<\/span><\/h3>\r\n<span style=\"font-weight: 400;\">Control boards regulate many appliance functions, and if an appliance is unresponsive, checking the board\u2019s DC voltage can help pinpoint the issue.<\/span>\r\n<ol>\r\n \t<li style=\"font-weight: 400;\" aria-level=\"1\"><span style=\"font-weight: 400;\">Locate the DC power terminals on the control board. These are usually labeled with voltage ratings.<\/span><\/li>\r\n \t<li style=\"font-weight: 400;\" aria-level=\"1\"><span style=\"font-weight: 400;\">Place the black probe on the negative (-) terminal and the red probe on the positive (+) terminal.<\/span><\/li>\r\n \t<li style=\"font-weight: 400;\" aria-level=\"1\"><span style=\"font-weight: 400;\">Read the voltage on the display \u2013 compare it to the expected voltage from the board\u2019s label or wiring diagram.<\/span><\/li>\r\n \t<li style=\"font-weight: 400;\" aria-level=\"1\"><span style=\"font-weight: 400;\">If voltage is present, the issue may be with the board itself; if no voltage is detected, the power supply or wiring may be faulty.<\/span><\/li>\r\n<\/ol>\r\n<h3><span style=\"font-weight: 400;\">What to do if a part fails a voltage test<\/span><\/h3>\r\n<span style=\"font-weight: 400;\">If a part doesn\u2019t show the correct voltage or isn\u2019t functioning as expected:<\/span>\r\n<ol>\r\n \t<li style=\"font-weight: 400;\" aria-level=\"1\"><span style=\"font-weight: 400;\">Double-check the connections. Loose wires or corroded terminals can cause power issues.<\/span><\/li>\r\n \t<li style=\"font-weight: 400;\" aria-level=\"1\"><span style=\"font-weight: 400;\">Confirm the correct voltage setting on the multimeter. Using the wrong mode can give incorrect readings.<\/span><\/li>\r\n \t<li style=\"font-weight: 400;\" aria-level=\"1\"><span style=\"font-weight: 400;\">Retest at different points in the circuit. Check power at multiple locations to find where the issue starts.<\/span><\/li>\r\n<\/ol>\r\n<h2><span style=\"font-weight: 400;\">Additional information<\/span><\/h2>\r\n<span style=\"font-weight: 400;\">Thanks for reading! If you need replacement parts, grab your model number and head to <\/span><a href=\"https:\/\/www.appliancepartspros.com\/\"><b>AppliancePartsPros.com<\/b><\/a><span style=\"font-weight: 400;\">. We offer over two million parts and most orders arrive in two business days. If you need help finding the right part or placing an order, you can contact our team at 1 (877) 477-7278.<\/span>\r\n\r\n<span style=\"font-weight: 400;\">While you\u2019re waiting for your new part to arrive, you can explore our <\/span><a href=\"https:\/\/www.appliancepartspros.com\/b\/\"><b>DIY blog<\/b><\/a><span style=\"font-weight: 400;\"> and watch thousands of video tutorials on <\/span><a href=\"https:\/\/www.youtube.com\/@appliancepartspros\/videos\"><b>our YouTube channel<\/b><\/a><span style=\"font-weight: 400;\">.<\/span>\r\n\r\n<span style=\"font-weight: 400;\">Be sure to follow us on <\/span><a href=\"http:\/\/facebook.com\/appliancepartspros\"><b>Facebook<\/b><\/a><span style=\"font-weight: 400;\">, <\/span><a href=\"https:\/\/twitter.com\/applpartspros\"><b>Twitter<\/b><\/a><span style=\"font-weight: 400;\"> and <\/span><a href=\"https:\/\/instagram.com\/appliancepartspros?igshid=OGQ5ZDc2ODk2ZA==\"><b>Instagram<\/b><\/a><span style=\"font-weight: 400;\"> to see our latest repair guides!<\/span>\r\n\r\n<b>Read more: <\/b>\r\n\r\n<a href=\"https:\/\/www.appliancepartspros.com\/b\/5-common-mistakes-that-shorten-the-lifespan-of-appliances\/\"><b>5 Common Mistakes That Shorten The Lifespan Of Appliances<\/b><\/a>\r\n\r\n<strong><a href=\"https:\/\/www.appliancepartspros.com\/b\/how-to-protect-your-appliances-in-a-power-outage\/\">How to Protect Your Appliances in a Power Outage<\/a><\/strong>\r\n\r\n<a href=\"https:\/\/www.appliancepartspros.com\/b\/how-to-prevent-appliance-fire-hazards\/\"><b>How to prevent appliance fire hazards<\/b><\/a>\n\n<em><span style=\"font-weight: 400;\">The information in this article may not apply to your specific appliance model.\n[\/av_textblock]\r\n\r\n[av_social_share title='Share this entry' buttons='' share_facebook='' share_twitter='' share_whatsapp='' share_pinterest='' share_reddit='' share_linkedin='' share_tumblr='' share_vk='' share_mail='' share_yelp='' yelp_link='https:\/\/www.yelp.com' style='' av-desktop-hide='' av-medium-hide='' av-small-hide='' av-mini-hide='' alb_description='' id='' custom_class='' av_uid='av-thk6ng']\r\n\r\n","_aviaLayoutBuilder_active":"active","footnotes":""},"categories":[495],"tags":[4988,4990,474,4989,87,4983,2383],"yoast_head":"<!-- This site is optimized with the Yoast SEO plugin v24.0 - https:\/\/yoast.com\/wordpress\/plugins\/seo\/ -->\r\n<title>AC vs DC voltage and how to test both with a multimeter<\/title>\r\n<meta name=\"description\" content=\"Learn how to test both AC and DC voltage with your multimeter to ensure your electrical systems are running smoothly.\" \/>\r\n<meta name=\"robots\" content=\"index, follow, max-snippet:-1, max-image-preview:large, max-video-preview:-1\" \/>\r\n<link rel=\"canonical\" href=\"https:\/\/www.appliancepartspros.com\/b\/ac-vs-dc-voltage-and-how-to-test-both-with-a-multimeter\/\" \/>\r\n<meta property=\"og:locale\" content=\"en_US\" \/>\r\n<meta property=\"og:type\" content=\"article\" \/>\r\n<meta 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