{"id":15240,"date":"2025-04-01T06:49:35","date_gmt":"2025-04-01T13:49:35","guid":{"rendered":"https:\/\/www.appliancepartspros.com\/b\/?p=15240"},"modified":"2026-07-14T11:06:55","modified_gmt":"2026-07-14T18:06:55","slug":"troubleshooting-error-code-01-on-an-lg-air-conditioner","status":"publish","type":"post","link":"https:\/\/www.appliancepartspros.com\/b\/troubleshooting-error-code-01-on-an-lg-air-conditioner\/","title":{"rendered":"Troubleshooting error code 01 on an LG air conditioner"},"content":{"rendered":"","protected":false},"excerpt":{"rendered":"<p>Learn how to troubleshoot error code 01 on your LG air conditioner with these easy steps and enjoy cool air once more.<\/p>\n","protected":false},"author":3,"featured_media":15332,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"_aviaLayoutBuilderCleanData":"[av_image src='https:\/\/www.appliancepartspros.com\/b\/wp-content\/uploads\/2025\/03\/Updated-blog-rectangle-9-2.jpg' attachment='15333' 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-1cy2tqg' 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-m8x8sgsn' admin_preview_bg='']\r\n<span style=\"font-weight: 400;\">Is your LG air conditioner displaying error code 01? Don't worry, this is a problem that you can fix yourself without the need for a costly service call, and we\u2019re here to help!<\/span>\r\n\r\n<span style=\"font-weight: 400;\">If you find out that you need any <\/span><a href=\"https:\/\/appliancepartspros.com\/air-conditioner-parts.html\"><span style=\"font-weight: 400;\">replacement parts<\/span><\/a><span style=\"font-weight: 400;\"> for your appliance<\/span> <span style=\"font-weight: 400;\">while you\u2019re troubleshooting, you can enter your <\/span><a href=\"https:\/\/www.appliancepartspros.com\/b\/how-to-find-your-appliances-model-number\/\"><b>model number<\/b><\/a><span style=\"font-weight: 400;\"> at <\/span><a href=\"https:\/\/www.appliancepartspros.com\/\"><b>AppliancePartsPros.com<\/b><\/a><span style=\"font-weight: 400;\"> to order them. Most orders arrive in just two business days, and we have thousands of free guides to show you how to install your new parts.<\/span>\n\n[lwptoc numeration=\"none\"]\r\n<p style=\"font-size:14.5px;margin:14px 0;font-family:system-ui,-apple-system,sans-serif\"><a href=\"#app-safety-notes\">Full safety notes below<\/a><\/p>\n\n<h2><span style=\"font-weight: 400;\">What the error code means<\/span><\/h2>\r\n<span style=\"font-weight: 400;\">The error code 01 on an LG multi-split air conditioner indicates an issue with the indoor unit's return air thermistor.<\/span>\r\n\r\n<span style=\"font-weight: 400;\">The return air thermistor is responsible for measuring the temperature of the air returning from the conditioned space back to the indoor unit. This temperature information is needed for the unit's control system to regulate the cooling or heating operation by cycling the compressor on or off to maintain the desired indoor temperature.<\/span>\r\n<h2><span style=\"font-weight: 400;\">Safety precautions<\/span><\/h2>\r\n<span style=\"font-weight: 400;\">When working on any appliance, remember to keep safety first. Here are some tips to keep in mind:\u00a0<\/span>\r\n<ul>\r\n \t<li style=\"font-weight: 400;\" aria-level=\"1\"><span style=\"font-weight: 400;\">Always power off and unplug your appliance or switch off the circuit breaker before attempting any maintenance or replacement work. This keeps you safe by preventing any risk of injury from electric shock.<\/span><\/li>\r\n \t<li style=\"font-weight: 400;\" aria-level=\"1\"><span style=\"font-weight: 400;\">Wear insulated work gloves to protect your hands from sharp metal parts, pinching hazards and debris.<\/span><\/li>\r\n \t<li style=\"font-weight: 400;\" aria-level=\"1\"><span style=\"font-weight: 400;\">Take your time and don\u2019t rush while working to prevent accidents and personal injuries.<\/span><\/li>\r\n \t<li style=\"font-weight: 400;\" aria-level=\"1\"><span style=\"font-weight: 400;\">Work in a well-lit area so you can clearly see and access the interior parts.<\/span><\/li>\r\n \t<li style=\"font-weight: 400;\" aria-level=\"1\"><span style=\"font-weight: 400;\">Clear your workspace of clutter and other obstacles. Keep children and pets away from the work area.<\/span><\/li>\r\n \t<li style=\"font-weight: 400;\" aria-level=\"1\"><span style=\"font-weight: 400;\">Never work on internal parts with bare wet hands. Make sure the work area is completely dry.<\/span><\/li>\r\n \t<li style=\"font-weight: 400;\" aria-level=\"1\"><span style=\"font-weight: 400;\">Check your user manual to see if there are specific installation or safety instructions for your part or appliance.\u00a0<\/span><\/li>\r\n \t<li style=\"font-weight: 400;\" aria-level=\"1\"><span style=\"font-weight: 400;\">Be gentle when handling or removing parts. Excessive force might damage the appliance or cause injury.<\/span><\/li>\r\n \t<li style=\"font-weight: 400;\" aria-level=\"1\"><span style=\"font-weight: 400;\">Wear safety glasses when working with chemicals, dust or cleaning large debris to prevent injury.\u00a0<\/span><\/li>\r\n \t<li style=\"font-weight: 400;\" aria-level=\"1\"><span style=\"font-weight: 400;\">If the appliance has recently been used, give it plenty of time for any heating parts to cool down before working on it.\u00a0<\/span><\/li>\r\n \t<li style=\"font-weight: 400;\" aria-level=\"1\"><span style=\"font-weight: 400;\">Take pictures or make a note of wiring terminals or other connections before disconnecting to prevent any problems with reassembly.<\/span><\/li>\r\n \t<li style=\"font-weight: 400;\" aria-level=\"1\"><span style=\"font-weight: 400;\">When working with wires, avoid touching any exposed wires or terminals. If you need to touch a wire, use a non-conductive tool or wear insulating gloves to prevent electrical shock.<\/span><\/li>\r\n<\/ul>\r\n<h2><span style=\"font-weight: 400;\">Tools and materials needed<\/span><\/h2>\r\n<ul>\r\n \t<li style=\"font-weight: 400;\" aria-level=\"1\"><span style=\"font-weight: 400;\">Multimeter<\/span><\/li>\r\n \t<li style=\"font-weight: 400;\" aria-level=\"1\"><span style=\"font-weight: 400;\">Screwdrivers<\/span><\/li>\r\n<\/ul>\r\n<b><i>Important<\/i><\/b><b><i>:<\/i><\/b><i><span style=\"font-weight: 400;\"> The specific tools required may vary depending on the model of your appliance and the type of fasteners used on it. Always consult the user manual or refer to any specific instructions provided by the manufacturer for the recommended tools for your appliance model.<\/span><\/i>\r\n<h2><span style=\"font-weight: 400;\">Troubleshooting steps<\/span><\/h2>\r\n<ol>\r\n \t<li style=\"font-weight: 400;\" aria-level=\"1\"><span style=\"font-weight: 400;\">Locate the indoor unit's return air thermistor, which is connected to the indoor unit's main control board (PCB).<\/span><\/li>\r\n \t<li style=\"font-weight: 400;\" aria-level=\"1\"><span style=\"font-weight: 400;\">Gently disconnect the return air thermistor from the main control board. It is usually connected via a small connector, so take care to release it without damaging the wiring or PCB.<\/span><\/li>\r\n \t<li style=\"font-weight: 400;\" aria-level=\"1\"><span style=\"font-weight: 400;\">Set your multimeter to the resistance (ohm) measurement mode.<\/span><\/li>\r\n \t<li style=\"font-weight: 400;\" aria-level=\"1\"><span style=\"font-weight: 400;\">Place the multimeter\u2019s probes on the two terminals of the thermistor.<\/span><\/li>\r\n \t<li style=\"font-weight: 400;\" aria-level=\"1\"><span style=\"font-weight: 400;\">At a temperature of around 70\u00b0F (21\u00b0C), the resistance should be in the range of 10-12k ohms.<\/span><\/li>\r\n \t<li style=\"font-weight: 400;\" aria-level=\"1\"><span style=\"font-weight: 400;\">Suppose the thermistor is exposed to a significantly different temperature. In that case, the resistance value will vary, but it should still fall within the acceptable range of 10-12k ohms when at normal room temperature.<\/span><\/li>\r\n \t<li style=\"font-weight: 400;\" aria-level=\"1\"><span style=\"font-weight: 400;\">If the resistance is outside the expected range, the thermistor is faulty and needs to be replaced. A malfunctioning thermistor may provide incorrect temperature readings, leading to errors or improper operation of the air conditioner.<\/span><\/li>\r\n \t<li style=\"font-weight: 400;\" aria-level=\"1\"><span style=\"font-weight: 400;\">If the resistance is within the normal range: The thermistor is likely functioning properly. In this case, the issue may lie with the main control board, and it will need to be replaced to resolve the error code 01.<\/span><\/li>\r\n<\/ol>\r\n<b>Next steps:<\/b>\r\n<ol>\r\n \t<li style=\"font-weight: 400;\" aria-level=\"1\"><span style=\"font-weight: 400;\">If the thermistor is faulty, proceed with purchasing a replacement part and installing it.<\/span><\/li>\r\n \t<li style=\"font-weight: 400;\" aria-level=\"1\"><span style=\"font-weight: 400;\">If the thermistor is working correctly, you will need to replace the main control board (PCB) since the error is likely related to the board\u2019s malfunction or failure.<\/span><\/li>\r\n<\/ol>\r\n<h2><span style=\"font-weight: 400;\">Additional information<\/span><\/h2>\r\n<span style=\"font-weight: 400;\">Thank you for reading! We hope this guide helped you get your LG multi split air conditioner working again.<\/span>\r\n\r\n<span style=\"font-weight: 400;\">If you have any other appliance repair needs or projects, don\u2019t hesitate to explore our other troubleshooting guides and videos.\u00a0<\/span>\r\n\r\n<span style=\"font-weight: 400;\">If you need replacement parts or some extra help with ordering them, grab your model number and head over to <\/span><a href=\"https:\/\/www.appliancepartspros.com\/\"><b>AppliancePartsPros.com<\/b><\/a><span style=\"font-weight: 400;\">, where you can chat with a pro, read our DIY blog and more.<\/span>\r\n\r\n<span style=\"font-weight: 400;\">Be sure to <\/span><a href=\"https:\/\/www.youtube.com\/@appliancepartspros\/videos\"><b>subscribe to us on YouTube<\/b><\/a><span style=\"font-weight: 400;\"> and 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;\">!<\/span>\r\n\r\n<b>Keep reading:\u00a0<\/b>\r\n\r\n<a href=\"https:\/\/www.appliancepartspros.com\/b\/how-to-get-better-air-quality-from-your-window-air-conditioner\/\"><b>How to get better air quality from your window air conditioner<\/b><\/a>\r\n\r\n<a href=\"https:\/\/www.appliancepartspros.com\/b\/how-to-clean-your-ac-unit-filter\/\"><b>How to Clean Your Air Conditioner the Easy Way<\/b><\/a><b>\u00a0\u00a0<\/b>\r\n\r\n<a href=\"https:\/\/www.appliancepartspros.com\/b\/what-is-a-ductless-mini-split-ac-and-how-does-it-work\/\"><b>What is a Ductless Mini-Split Air Conditioner And How Does it Work?<\/b><\/a><b>\u00a0\u00a0<\/b>\n\n<em><span style=\"font-weight: 400;\">The troubleshooting information provided in this article may not apply to your specific appliance model. While we strive to offer helpful advice for DIY appliance repairs, variations in models and configurations can lead to differences in troubleshooting steps, error codes and part replacements. For the most accurate guidance, we strongly recommend consulting the technical sheet for your specific appliance model.<\/span><\/em>\n\n<div id=\"app-safety-notes\" style=\"border:1px solid #E6E6E6;border-radius:8px;overflow:hidden;margin:22px 0;font-family:system-ui,-apple-system,sans-serif\"><div style=\"background:#1C437C;color:#fff;padding:9px 16px;font-weight:700;font-size:15px\">\u26a1&nbsp;Electrical safety \u2014 before you start<\/div><ul style=\"margin:0;padding:14px 20px 14px 38px;font-size:15px;line-height:1.6;color:#1A1A1A;background:#fff\"><li style=\"margin:6px 0\"><b>Disconnect power<\/b> before you start \u2014 unplug it or switch off the breaker, and <b>confirm it's dead<\/b>.<\/li><li style=\"margin:6px 0\">Follow your <b>local electrical code<\/b>.<\/li><li style=\"margin:6px 0\">Anything involving <b>household wiring, outlets, or the breaker panel<\/b> itself is <b>licensed-electrician territory<\/b>.<\/li><\/ul><\/div>\n[\/av_textblock]\r\n\r\n[av_social_share 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