{"id":653,"date":"2025-07-03T03:32:28","date_gmt":"2025-07-03T01:32:28","guid":{"rendered":"https:\/\/wp.stromer-tech.info\/?post_type=ht_kb&#038;p=653"},"modified":"2026-06-12T22:44:59","modified_gmt":"2026-06-12T20:44:59","slug":"e-21020e-support-problems","status":"publish","type":"ht_kb","link":"https:\/\/wp.stromer-tech.info\/en\/knowledge-base\/e-21020e-unterstuetzungsprobleme\/","title":{"rendered":"E 21020E | Support problems"},"content":{"rendered":"<h3 class=\"wp-block-heading\">Usual things<\/h3>\n\n\n\n<p class=\"wp-block-paragraph\">The error can have various causes:<\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li>Moisture where it shouldn't be, e.g., after a rainy drive or excessive washing.<\/li>\n\n\n\n<li>Short circuit in the system: <br>e.g. cables pinched or crushed in the steerer tube\/head tube;<br>e.g. cable for the front lighting.<\/li>\n\n\n\n<li>Motor controller, motor, motor cable connector, or cable in the bottom bracket area.<\/li>\n<\/ul>\n\n\n\n<h3 class=\"wp-block-heading\">Test the following<\/h3>\n\n\n\n<ul class=\"wp-block-list\">\n<li>Disconnect the motor cable on the left chain stay from the bike electrics. Then go to the service menu and press 'Boost'. If the error no longer occurs, the motor is defective.<\/li>\n\n\n\n<li>Disconnect the three motor phase cables (blue\/green\/yellow) in the bottom bracket area. On almost all models, the down tube cover must be removed for this. Go back to the service menu and press \u201aBoost\u2018. If the error persists, the controller (MCU) is defective.<\/li>\n\n\n\n<li>If the previous points do not provide a clear answer, it could be due to the cable or the plug connection between the motor and controller (MCU). The cable with the plug connection is located in the bottom bracket area.<\/li>\n<\/ul>\n\n\n\n<h3 class=\"wp-block-heading\">Solutions<\/h3>\n\n\n\n<p class=\"wp-block-paragraph\"><strong>Motor plug:<\/strong> Check the screw connection(s) in the left chain stay for looseness and moisture (blow out with air, allow to dry)<\/p>\n\n\n\n<p class=\"wp-block-paragraph\"><strong>Motor cable routing in the bottom bracket area:<\/strong> On older models, the connections of the 3 <a href=\"https:\/\/wp.stromer-tech.info\/en\/knowledge-base\/check-wiring\/#motorkabel-im-trelagerbereich\">Motor cable not with shrink tubing<\/a> protected. They were therefore susceptible to moisture entering the bottom bracket area via the horn opening when riding in the rain.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\"><strong>Checks \/ Tests:<\/strong> The SIT (System Integration Test) can be used to test Stromer components.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">&gt; <a href=\"https:\/\/wp.stromer-tech.info\/en\/knowledge-base\/sit-test-runner-components-test\/\" data-type=\"ht_kb\" data-id=\"822\">SIT (Test Runner) - Testing components<\/a><br>&gt; <a href=\"https:\/\/wp.stromer-tech.info\/en\/knowledge-base\/battery-self_check-recognize-problems\/\" data-type=\"ht_kb\" data-id=\"676\">Battery SELF_CHECK - Recognize problems<\/a><\/p>\n\n\n\n<p class=\"wp-block-paragraph\"><\/p>","protected":false},"excerpt":{"rendered":"<p>Usachen Der Fehler kann verschiedene Ursachen haben: Teste folgendes L\u00f6sungen Motorstecker: Verschraubung(en) in der li Kettenstrebe auf Lockerheit und Feuchtigkeit pr\u00fcfen (mit Luft ausblasen, trocknen lassen) Motor-Kabelf\u00fchrung im Tretlagerbereich: Bei \u00e4lteren Modelle waren die Verbindungen der 3 Motorkabel nicht mit Schrumpfschlauch gesch\u00fctzt. Sie waren daher anf\u00e4llig auf N\u00e4sse die \u00fcber&#8230;<\/p>","protected":false},"author":1,"comment_status":"open","ping_status":"closed","template":"","format":"standard","meta":{"footnotes":""},"ht-kb-category":[136],"ht-kb-tag":[],"class_list":["post-653","ht_kb","type-ht_kb","status-publish","format-standard","hentry","ht_kb_category-fehler-und-warnmeldungen"],"_links":{"self":[{"href":"https:\/\/wp.stromer-tech.info\/en\/wp-json\/wp\/v2\/ht-kb\/653","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/wp.stromer-tech.info\/en\/wp-json\/wp\/v2\/ht-kb"}],"about":[{"href":"https:\/\/wp.stromer-tech.info\/en\/wp-json\/wp\/v2\/types\/ht_kb"}],"author":[{"embeddable":true,"href":"https:\/\/wp.stromer-tech.info\/en\/wp-json\/wp\/v2\/users\/1"}],"replies":[{"embeddable":true,"href":"https:\/\/wp.stromer-tech.info\/en\/wp-json\/wp\/v2\/comments?post=653"}],"version-history":[{"count":15,"href":"https:\/\/wp.stromer-tech.info\/en\/wp-json\/wp\/v2\/ht-kb\/653\/revisions"}],"predecessor-version":[{"id":11630,"href":"https:\/\/wp.stromer-tech.info\/en\/wp-json\/wp\/v2\/ht-kb\/653\/revisions\/11630"}],"wp:attachment":[{"href":"https:\/\/wp.stromer-tech.info\/en\/wp-json\/wp\/v2\/media?parent=653"}],"wp:term":[{"taxonomy":"ht_kb_category","embeddable":true,"href":"https:\/\/wp.stromer-tech.info\/en\/wp-json\/wp\/v2\/ht-kb-category?post=653"},{"taxonomy":"ht_kb_tag","embeddable":true,"href":"https:\/\/wp.stromer-tech.info\/en\/wp-json\/wp\/v2\/ht-kb-tag?post=653"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}