{"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\/es\/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>C\u00f3digos de diagn\u00f3stico cubiertos<\/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>Flujo de soluci\u00f3n de problemas<\/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>Pruebas de diagn\u00f3stico relacionadas<\/h2>\n<ul>\n<li><a href=\"https:\/\/cetechsupport.com\/es\/?p=930850\">37MGRA IPM Continuidad de la verificaci\u00f3n<\/a><\/li>\n<\/ul>\n<p><small><em>Fuente del flujo de trabajo: manual de servicio original 37MGRA-02SM PDF. Nombres de c\u00f3digos de error contrastados con 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\/es\/author\/joshg\/"},"uagb_comment_info":0,"uagb_excerpt":"Troubleshooting workflow for EH BA, EH 3A, EH 3B.","_links":{"self":[{"href":"https:\/\/cetechsupport.com\/es\/wp-json\/wp\/v2\/posts\/930880","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/cetechsupport.com\/es\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/cetechsupport.com\/es\/wp-json\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/cetechsupport.com\/es\/wp-json\/wp\/v2\/users\/1"}],"replies":[{"embeddable":true,"href":"https:\/\/cetechsupport.com\/es\/wp-json\/wp\/v2\/comments?post=930880"}],"version-history":[{"count":5,"href":"https:\/\/cetechsupport.com\/es\/wp-json\/wp\/v2\/posts\/930880\/revisions"}],"predecessor-version":[{"id":931896,"href":"https:\/\/cetechsupport.com\/es\/wp-json\/wp\/v2\/posts\/930880\/revisions\/931896"}],"wp:attachment":[{"href":"https:\/\/cetechsupport.com\/es\/wp-json\/wp\/v2\/media?parent=930880"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/cetechsupport.com\/es\/wp-json\/wp\/v2\/categories?post=930880"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/cetechsupport.com\/es\/wp-json\/wp\/v2\/tags?post=930880"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}