{"id":43365,"date":"2026-09-12T15:47:39","date_gmt":"2026-09-12T13:47:39","guid":{"rendered":"https:\/\/fvcomponentes.com\/inversor-fronius-no-produce-que-revisar\/"},"modified":"2026-09-12T15:47:39","modified_gmt":"2026-09-12T13:47:39","slug":"the-fronius-inverter-isnt-working-what-should-i-check","status":"publish","type":"post","link":"https:\/\/fvcomponentes.com\/en\/inversor-fronius-no-produce-que-revisar\/","title":{"rendered":"My Fronius inverter isn\u2019t working: what to check step by step (307, 509, 522, no grid)"},"content":{"rendered":"<p class=\"wp-block-paragraph\">A Fronius inverter that is hardly ever producing power is likely to be faulty. In most cases, the problem lies with the solar array, an open-circuit protection device or the mains supply. Follow this sequence of checks and you\u2019ll be able to resolve most issues without having to dismantle anything.<\/p>\n\n\n\n<h2 class=\"wp-block-heading\">1. What does the investor say?<\/h2>\n\n\n\n<p class=\"wp-block-paragraph\">Before you do anything, check the display (Primo\/Symo) or the web interface and Solar.web (GEN24). There are three possible scenarios:<\/p>\n\n\n\n<ul class=\"wp-block-list\"><li><strong>Screen off and LEDs off:<\/strong> There is no DC or AC voltage. Proceed to step 2.<\/li><li><strong>Screen lit with status code:<\/strong> look for the code in the <a href=\"https:\/\/fvcomponentes.com\/en\/status-codes-fronius-a-comprehensive-guide\/\">Fronius code guide<\/a>. The most common ones are 307, 509, 522\/523 and those in the 100 series.<\/li><li><strong>Screen on, no code and 0 W:<\/strong> Normally, the inverter is waiting for the DC voltage to exceed the minimum start-up voltage, or the smart meter has a feed-in limit of 0 W and there is no consumption in the house (see <a href=\"https:\/\/fvcomponentes.com\/en\/fronius-smart-meter-limit-feed-in-to-the-grid-to-0\/\">Smart Meter<\/a>).<\/li><\/ul>\n\n\n\n<h2 class=\"wp-block-heading\">2. Protective devices: DC isolator, fuses and AC circuit breakers<\/h2>\n\n\n\n<ul class=\"wp-block-list\"><li>The <strong>DC isolator<\/strong> The circuit breaker must be set to ON. Following a storm, it is common to find it switched off by the SPD or by the installer themselves.<\/li><li>Check out the <strong>string fuses<\/strong> in the DC panel (if any) and the <strong>surge protector<\/strong>: An SPD with the indicator in the red must be replaced.<\/li><li>The <strong>AC circuit breaker<\/strong> The inverter must be connected and, in three-phase Symo systems, all three phases and the neutral must be connected (code 448 if N is missing).<\/li><\/ul>\n\n\n\n<h2 class=\"wp-block-heading\">3. Solar field voltage<\/h2>\n\n\n\n<p class=\"wp-block-paragraph\">The Fronius requires a minimum DC voltage to start up: approximately <strong>80 V on Primo\/Symo<\/strong> and a few <strong>65 V at GEN24<\/strong>. With the system switched off, and only if you have electrical training, measure the open-circuit voltage (Voc) of each string at the DC terminals:<\/p>\n\n\n\n<ul class=\"wp-block-list\"><li><strong>0 V:<\/strong> Open circuit. Loose MC4 connector, blown fuse, broken cable or a panel with a damaged diode\/junction box.<\/li><li><strong>Very low voltage compared to the other string:<\/strong> There is one or more panels that are short-circuited or in the shade. This corresponds to code 522\/523.<\/li><li><strong>Voltage is correct but it won\u2019t start:<\/strong> reversed polarity (rare, but it can happen after a repair) or an internal fault.<\/li><\/ul>\n\n\n\n<p class=\"wp-block-paragraph\">A quick tip: in Solar.web, compare the MPPT1 and MPPT2 curves. If one string is flat whilst the other is producing power, the fault lies with that string, not the inverter.<\/p>\n\n\n\n<h2 class=\"wp-block-heading\">4. Electricity grid<\/h2>\n\n\n\n<ul class=\"wp-block-list\"><li>Codes 102\u2013108: the grid is out of range. The inverter will only reconnect once the voltage has stabilised. If this occurs daily, measure the voltage at the connection point: if it exceeds 253 V, the inverter will shut down in accordance with regulations.<\/li><li>Code 567: the inverter reduces output because the mains voltage rises when feeding into the grid. This is usually due to a long or undersized AC cable between the inverter and the distribution board.<\/li><li>Also check the <strong>country code \/ network standard<\/strong> configured. An inverter configured for another country may not be compatible with the Spanish grid.<\/li><\/ul>\n\n\n\n<h2 class=\"wp-block-heading\">5. Code 509: no injection in the last 24 hours<\/h2>\n\n\n\n<p class=\"wp-block-paragraph\">This is a warning, not a fault: the inverter has not been generating power for a full day. This message appears following an open isolator, snow or a prolonged power cut. If the solar array and the grid are both working properly, restart the inverter.<\/p>\n\n\n\n<h2 class=\"wp-block-heading\">6. Full reset<\/h2>\n\n\n\n<ol class=\"wp-block-list\"><li>1. Switch off the AC circuit breaker.<\/li><li>2. Open the DC isolator.<\/li><li>3. Wait 5 minutes until all the LEDs have gone out.<\/li><li>4. Close the DC isolator and wait for the display to start up.<\/li><li>5. Switch on the AC circuit breaker. The inverter takes between 1 and 3 minutes to synchronise with the grid.<\/li><\/ol>\n\n\n\n<h2 class=\"wp-block-heading\">7. If it still isn\u2019t producing<\/h2>\n\n\n\n<p class=\"wp-block-paragraph\">At this stage, the remaining causes are hardware-related: power stage, mains relay (457), current sensor (315\/474) or persistent insulation fault (502). As an authorised Fronius service centre, we can check the inverter\u2019s service history on Solar.web and process the warranty claim or repair.<\/p>\n\n\n\n<p><em>FV Componentes is <strong>Fronius authorised technical service centre<\/strong> (Fronius System Partner). If the problem persists after carrying out these checks, please open a ticket at <a href=\"https:\/\/fvcomponentes.com\/en\/technical-support\/\">Technical support<\/a> with the serial number and a screenshot of Solar.web, and we\u2019ll diagnose it.<\/em><\/p>","protected":false},"excerpt":{"rendered":"<p>Troubleshooting guide when a Fronius Primo, Symo or GEN24 fails to start or does not inject power: DC isolator, fuses, string voltage, AC mains, error codes 307, 509, 522\/523 and Solar.web.<\/p>","protected":false},"author":1,"featured_media":0,"comment_status":"","ping_status":"","sticky":false,"template":"","format":"standard","meta":{"site-sidebar-layout":"default","site-content-layout":"","ast-site-content-layout":"default","site-content-style":"default","site-sidebar-style":"default","ast-global-header-display":"","ast-banner-title-visibility":"","ast-main-header-display":"","ast-hfb-above-header-display":"","ast-hfb-below-header-display":"","ast-hfb-mobile-header-display":"","site-post-title":"","ast-breadcrumbs-content":"","ast-featured-img":"","footer-sml-layout":"","ast-disable-related-posts":"","theme-transparent-header-meta":"","adv-header-id-meta":"","stick-header-meta":"","header-above-stick-meta":"","header-main-stick-meta":"","header-below-stick-meta":"","astra-migrate-meta-layouts":"default","ast-page-background-enabled":"default","ast-page-background-meta":{"desktop":{"background-color":"var(--ast-global-color-4)","background-image":"","background-repeat":"repeat","background-position":"center center","background-size":"auto","background-attachment":"scroll","background-type":"","background-media":"","overlay-type":"","overlay-color":"","overlay-opacity":"","overlay-gradient":""},"tablet":{"background-color":"","background-image":"","background-repeat":"repeat","background-position":"center center","background-size":"auto","background-attachment":"scroll","background-type":"","background-media":"","overlay-type":"","overlay-color":"","overlay-opacity":"","overlay-gradient":""},"mobile":{"background-color":"","background-image":"","background-repeat":"repeat","background-position":"center center","background-size":"auto","background-attachment":"scroll","background-type":"","background-media":"","overlay-type":"","overlay-color":"","overlay-opacity":"","overlay-gradient":""}},"ast-content-background-meta":{"desktop":{"background-color":"var(--ast-global-color-5)","background-image":"","background-repeat":"repeat","background-position":"center center","background-size":"auto","background-attachment":"scroll","background-type":"","background-media":"","overlay-type":"","overlay-color":"","overlay-opacity":"","overlay-gradient":""},"tablet":{"background-color":"var(--ast-global-color-5)","background-image":"","background-repeat":"repeat","background-position":"center center","background-size":"auto","background-attachment":"scroll","background-type":"","background-media":"","overlay-type":"","overlay-color":"","overlay-opacity":"","overlay-gradient":""},"mobile":{"background-color":"var(--ast-global-color-5)","background-image":"","background-repeat":"repeat","background-position":"center center","background-size":"auto","background-attachment":"scroll","background-type":"","background-media":"","overlay-type":"","overlay-color":"","overlay-opacity":"","overlay-gradient":""}},"footnotes":""},"categories":[1004],"tags":[],"class_list":["post-43365","post","type-post","status-publish","format-standard","hentry","category-manuales-tutoriales-solares"],"_links":{"self":[{"href":"https:\/\/fvcomponentes.com\/en\/wp-json\/wp\/v2\/posts\/43365","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/fvcomponentes.com\/en\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/fvcomponentes.com\/en\/wp-json\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/fvcomponentes.com\/en\/wp-json\/wp\/v2\/users\/1"}],"replies":[{"embeddable":true,"href":"https:\/\/fvcomponentes.com\/en\/wp-json\/wp\/v2\/comments?post=43365"}],"version-history":[{"count":0,"href":"https:\/\/fvcomponentes.com\/en\/wp-json\/wp\/v2\/posts\/43365\/revisions"}],"wp:attachment":[{"href":"https:\/\/fvcomponentes.com\/en\/wp-json\/wp\/v2\/media?parent=43365"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/fvcomponentes.com\/en\/wp-json\/wp\/v2\/categories?post=43365"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/fvcomponentes.com\/en\/wp-json\/wp\/v2\/tags?post=43365"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}