# Taz6: Hot End Loses Power Once Part Fan Turns on: New RAMBo **URL:** \ **Category:** Hardware\ **Created:** [February 24, 2020, 1:15am UTC](https://forum.lulzbot.com/t/taz6-hot-end-loses-power-once-part-fan-turns-on-new-rambo/20886 "2020-02-24T01:15:53Z")\ **Posts on this page:** 6\ **Page:** 1
**Author:** ![dantivilo](https://avatars.discourse-cdn.com/v4/letter/d/7993a0/32.png) [@dantivilo](https://forum.lulzbot.com/u/dantivilo)\ **Post date:** [February 24, 2020, 1:15am UTC](https://forum.lulzbot.com/t/taz6-hot-end-loses-power-once-part-fan-turns-on-new-rambo/20886/1 "2020-02-24T01:15:53Z")
**Gear** : I am running a Taz 6 with an Aerostruder tool head, modular build plate. **Problem** : My printer works perfectly for the first layer, and then once the part fan turns on for the second layer, the hot end completely loses power and slowly cools down until I get a hot end error message. This error only occurs during printing. Before starting a print I can heat the bed, hot end and run the fans before a print and everything is running just fine, it’s only during a print. **Background** : I recently swapped out my original RAMBo v1.3 which was giving me problems. I took detailed pictures and compared notes to the OHAI page to make sure everything was connected back to the same spot. **What I have done** : I have already checked all 2 fuses on the RAMBo, and they are all working. all of the wires look like they are in good shape. Observations: I have noticed that the new rambo I purchased does not include pins for the X1 position (see attached image). This cable seems to go to the second extruder. So I didn’t think this was a huge deal. Does anyone have any ideas on what could be causing the sudden loss of power as soon as the fans startup? I ordered the RAMBo from ultimachine-- not Luzbot-- maybe there’s something I have to do before setting up the RAMBo? ![Inspect_r3YRete.jpg.600x0_q85](https://us1.discourse-cdn.com/flex020/uploads/lulzbot/original/2X/5/56c9c2db00def95e2a15269327c9aaae9ccf846e.jpeg) ---
**Author:** ![dantivilo](https://avatars.discourse-cdn.com/v4/letter/d/7993a0/32.png) [@dantivilo](https://forum.lulzbot.com/u/dantivilo)\ **Post date:** [March 19, 2020, 6:18am UTC](https://forum.lulzbot.com/t/taz6-hot-end-loses-power-once-part-fan-turns-on-new-rambo/20886/2 "2020-03-19T06:18:11Z")
Anyone else have similar issues?? ---
**Author:** ![b-morgan](https://sea2.discourse-cdn.com/flex020/user_avatar/forum.lulzbot.com/b-morgan/32/11517_2.png) [@b-morgan](https://forum.lulzbot.com/u/b-morgan)\ **Post date:** [March 21, 2020, 1:51pm UTC](https://forum.lulzbot.com/t/taz6-hot-end-loses-power-once-part-fan-turns-on-new-rambo/20886/3 "2020-03-21T13:51:19Z")
Did you flash the appropriate LulzBot firmware for your printer / tool head? ---
**Author:** ![dantivilo](https://avatars.discourse-cdn.com/v4/letter/d/7993a0/32.png) [@dantivilo](https://forum.lulzbot.com/u/dantivilo)\ **Post date:** [March 21, 2020, 7:13pm UTC](https://forum.lulzbot.com/t/taz6-hot-end-loses-power-once-part-fan-turns-on-new-rambo/20886/4 "2020-03-21T19:13:48Z")
Great suggestion, I just tried flashing different firmware, even the older version for the areostruder, and I’m still having the same issue. I may try original toolhead that came with the Taz 6, it might be an issue with the tool head. I really think it’s something on the RAMBo, because before I start a print, I can heat the bed, heat the hot end, and run the part fan and everything works. It’s only when I’m in the middle of a print that I get issues of the hot end losing power when the part fan turns on. ---
**Author:** ![b-morgan](https://sea2.discourse-cdn.com/flex020/user_avatar/forum.lulzbot.com/b-morgan/32/11517_2.png) [@b-morgan](https://forum.lulzbot.com/u/b-morgan)\ **Post date:** [March 21, 2020, 9:32pm UTC](https://forum.lulzbot.com/t/taz6-hot-end-loses-power-once-part-fan-turns-on-new-rambo/20886/5 "2020-03-21T21:32:32Z")
I’d suspect a broken wire somewhere in the harness that is making intermittent contact as the head moves around. ---
**Author:** ![dantivilo](https://avatars.discourse-cdn.com/v4/letter/d/7993a0/32.png) [@dantivilo](https://forum.lulzbot.com/u/dantivilo)\ **Post date:** [March 21, 2020, 11:52pm UTC](https://forum.lulzbot.com/t/taz6-hot-end-loses-power-once-part-fan-turns-on-new-rambo/20886/6 "2020-03-21T23:52:09Z")
I think you are right! I changed out the tool head and everything worked with the old one just fine. I out the aerostruder back on, and it started to work again! It must have been a loose wire that moved when I uninstalled/installed it. I might just have to go through wire by wire to make sure everything is connected. Thanks!