{"id":930880,"date":"2026-08-25T16:42:03","date_gmt":"2026-08-25T20:42:03","guid":{"rendered":"https:\/\/cetechsupport.com\/?p=930880"},"modified":"2026-09-22T13:39:53","modified_gmt":"2026-09-22T17:39:53","slug":"37mgra-eh-ba-eh-3a-eh-3b","status":"publish","type":"post","link":"https:\/\/cetechsupport.com\/fr\/37mgra-eh-ba-eh-3a-eh-3b\/","title":{"rendered":"37MGRA EH bA (Communication Malfunction Between Indoor Unit and External Fan Module)\/ EH 3A(External Fan DC Bus Voltage Is Too Low Protection)\/ EH 3b (External Fan DC Bus Voltage is Too High) Fault) Diagnosis and Solution"},"content":{"rendered":"<div class=\"diagnostic-code-summary\">\n<h2>Codes de diagnostic couverts<\/h2>\n<p><strong>EH BA, EH 3A, EH 3B<\/strong><\/p>\n<ul>\n<li>EH BA &#8211; Communication Error Between the Indoor Unit and External Fan Module<\/li>\n<li>EH 3A &#8211; External Fan DC Bus Voltage Too Low Protection<\/li>\n<li>EH 3B &#8211; External Fan DC Bus Voltage Too High Fault<\/li>\n<\/ul>\n<p>Description: Indoor unit does not receive the feedback from external fan module during 150 seconds. or Indoor unit receives abnormal increases or decreases in voltage from external fan module. Recommended parts to prepare: Indoor main PCB Troubleshooting and repair:<\/p>\n<\/div>\n<h2>Flux de travail de d\u00e9pannage<\/h2>\n<figure class=\"wp-block-image size-full\"><a href=\"https:\/\/cetechsupport.com\/wp-content\/uploads\/2026\/08\/37mgra-v5-37mgra-eh-ba-eh-3a-eh-3b-1.png\"><img loading=\"lazy\" decoding=\"async\" width=\"1946\" height=\"1295\" class=\"wp-image-931011\" src=\"https:\/\/cetechsupport.com\/wp-content\/uploads\/2026\/08\/37mgra-v5-37mgra-eh-ba-eh-3a-eh-3b-1.png\" alt=\"EH bA (Communication Malfunction Between Indoor Unit and External Fan Module)\/ EH 3A(External Fan DC Bus Voltage Is Too Low Protection)\/ EH 3b (External Fan DC Bus Voltage is Too High) Fault) Diagnosis and Solution workflow\" srcset=\"https:\/\/cetechsupport.com\/wp-content\/uploads\/2026\/08\/37mgra-v5-37mgra-eh-ba-eh-3a-eh-3b-1.png 1946w, https:\/\/cetechsupport.com\/wp-content\/uploads\/2026\/08\/37mgra-v5-37mgra-eh-ba-eh-3a-eh-3b-1-300x200.png 300w, https:\/\/cetechsupport.com\/wp-content\/uploads\/2026\/08\/37mgra-v5-37mgra-eh-ba-eh-3a-eh-3b-1-1024x681.png 1024w, https:\/\/cetechsupport.com\/wp-content\/uploads\/2026\/08\/37mgra-v5-37mgra-eh-ba-eh-3a-eh-3b-1-768x511.png 768w, https:\/\/cetechsupport.com\/wp-content\/uploads\/2026\/08\/37mgra-v5-37mgra-eh-ba-eh-3a-eh-3b-1-1536x1022.png 1536w, https:\/\/cetechsupport.com\/wp-content\/uploads\/2026\/08\/37mgra-v5-37mgra-eh-ba-eh-3a-eh-3b-1-18x12.png 18w\" sizes=\"auto, (max-width: 1946px) 100vw, 1946px\" \/><\/a><figcaption>EHbA (Communication Malfunction Between Indoor Unit and External Fan Module)\/ EH3A(External Fan DC Bus Voltage Is Too Low Protection)\/ EH3b (External Fan DC Bus Voltage is Too High) Fault) Diagnosis and Solution workflow<\/figcaption><\/figure>\n<h2>Contr\u00f4les diagnostiques associ\u00e9s<\/h2>\n<ul>\n<li><a href=\"https:\/\/cetechsupport.com\/fr\/?p=930850\">V\u00e9rification de la continuit\u00e9 37MGRA IPM<\/a><\/li>\n<\/ul>\n<p><small><em>Source du flux de travail : manuel de service d'origine 37MGRA-02SM PDF. Noms des codes d'erreur recoup\u00e9s avec 37MGRA-04SI.<\/em><\/small><\/p>","protected":false},"excerpt":{"rendered":"<p>Troubleshooting workflow for EH BA, EH 3A, EH 3B.<\/p>","protected":false},"author":1,"featured_media":0,"comment_status":"closed","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"_coblocks_attr":"","_coblocks_dimensions":"","_coblocks_responsive_height":"","_coblocks_accordion_ie_support":"","_uag_custom_page_level_css":"","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":"set","ast-page-background-enabled":"default","ast-page-background-meta":{"desktop":{"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":""},"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":[241],"tags":[243,294,295,293],"class_list":["post-930880","post","type-post","status-publish","format-standard","hentry","category-37mgra-diagnostic-codes","tag-37mgra","tag-eh-3a","tag-eh-3b","tag-eh-ba"],"uagb_featured_image_src":{"full":false,"thumbnail":false,"medium":false,"medium_large":false,"large":false,"1536x1536":false,"2048x2048":false,"trp-custom-language-flag":false},"uagb_author_info":{"display_name":"Carrier Enterprise","author_link":"https:\/\/cetechsupport.com\/fr\/author\/joshg\/"},"uagb_comment_info":0,"uagb_excerpt":"Troubleshooting workflow for EH BA, EH 3A, EH 3B.","_links":{"self":[{"href":"https:\/\/cetechsupport.com\/fr\/wp-json\/wp\/v2\/posts\/930880","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/cetechsupport.com\/fr\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/cetechsupport.com\/fr\/wp-json\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/cetechsupport.com\/fr\/wp-json\/wp\/v2\/users\/1"}],"replies":[{"embeddable":true,"href":"https:\/\/cetechsupport.com\/fr\/wp-json\/wp\/v2\/comments?post=930880"}],"version-history":[{"count":5,"href":"https:\/\/cetechsupport.com\/fr\/wp-json\/wp\/v2\/posts\/930880\/revisions"}],"predecessor-version":[{"id":931896,"href":"https:\/\/cetechsupport.com\/fr\/wp-json\/wp\/v2\/posts\/930880\/revisions\/931896"}],"wp:attachment":[{"href":"https:\/\/cetechsupport.com\/fr\/wp-json\/wp\/v2\/media?parent=930880"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/cetechsupport.com\/fr\/wp-json\/wp\/v2\/categories?post=930880"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/cetechsupport.com\/fr\/wp-json\/wp\/v2\/tags?post=930880"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}