# On initial heatup, the Hotend takes a dip then finishes heating up. (PID has been run and saved) **URL:** \ **Category:** Bug Reports\ **Created:** [28 July 2022 02:50 UTC](https://marlin.crc.id.au/forum/t/on-initial-heatup-the-hotend-takes-a-dip-then-finishes-heating-up-pid-has-been-run-and-saved/1038 "2022-07-28T02:50:16Z")\ **Posts on this page:** 4\ **Page:** 1
**Author:** ![jakeo84](https://marlin.crc.id.au/forum/user_avatar/marlin.crc.id.au/jakeo84/32/532_2.png) [@jakeo84](https://marlin.crc.id.au/forum/u/jakeo84)\ **Post date:** [28 July 2022 02:50 UTC](https://marlin.crc.id.au/forum/t/on-initial-heatup-the-hotend-takes-a-dip-then-finishes-heating-up-pid-has-been-run-and-saved/1038/1 "2022-07-28T02:50:16Z")
On the initial heatup, the Hotend temp gets to 195/200, then dips down to 185 before recovering and getting up to temp. Most of the time this triggers the thermal runaway protections. It has been happening on the most current build and the one from a week ago as well. Ender3-v4.2.7-BLTouch-20220728.bin ![Screen Shot 2022-07-27 at 9.46.16 PM](https://marlin.crc.id.au/forum/uploads/default/original/1X/48d33d80ec7e97e6c4d66ccc869b36c4ec33d078.png) ---
**Author:** ![CRCinAU](https://marlin.crc.id.au/forum/user_avatar/marlin.crc.id.au/crcinau/32/1337_2.png) [@CRCinAU](https://marlin.crc.id.au/forum/u/CRCinAU)\ **Post date:** [28 July 2022 03:01 UTC](https://marlin.crc.id.au/forum/t/on-initial-heatup-the-hotend-takes-a-dip-then-finishes-heating-up-pid-has-been-run-and-saved/1038/2 "2022-07-28T03:01:20Z")
Check the PID Tuning part of the Ender 3 V2 FAQ - it applies here too. > [@Ender 3 V2 - Frequently Asked Questions](https://marlin.crc.id.au/forum/t/ender-3-v2-frequently-asked-questions/17#heading--pidtuning): > > Table of Contents: [Which firmware do I need for my printer?](#heading--whichfirmware)[Flashing Firmware](#heading--firmware)[Recovering from a black screen after firmware update](#heading--firmwareblackscreen)[Help! My screen shows a picture of clouds!](#heading--dwin_screen)[My screen is in Chinese, how do I switch it back to English?](#heading--chinese)[My Print Speed shows a crazy number and the printer goes nuts!](#heading--printspeedbug)[How do I wire up a BLTouch?](#heading--bltouch)[I’ve added a BLTouch, how do I set my Z-Offset?](#heading--zoffset)[When I try to print, my printer just ejects all the filament!](#heading--runout)[I want to use hardware retraction, what do I do?](#heading--fwretract)[PID Tuning](#heading--pidtuning)[Wha…](#heading--vref) ---
**Author:** ![jakeo84](https://marlin.crc.id.au/forum/user_avatar/marlin.crc.id.au/jakeo84/32/532_2.png) [@jakeo84](https://marlin.crc.id.au/forum/u/jakeo84)\ **Post date:** [28 July 2022 03:29 UTC](https://marlin.crc.id.au/forum/t/on-initial-heatup-the-hotend-takes-a-dip-then-finishes-heating-up-pid-has-been-run-and-saved/1038/3 "2022-07-28T03:29:28Z")
Thank you, but The PID Tuning has been done. Once the Hotend is up to temp, there is less than 1° variation through out my prints. But always on the initial heat up, it does that small dip. ---
**Author:** ![CRCinAU](https://marlin.crc.id.au/forum/user_avatar/marlin.crc.id.au/crcinau/32/1337_2.png) [@CRCinAU](https://marlin.crc.id.au/forum/u/CRCinAU)\ **Post date:** [28 July 2022 05:05 UTC](https://marlin.crc.id.au/forum/t/on-initial-heatup-the-hotend-takes-a-dip-then-finishes-heating-up-pid-has-been-run-and-saved/1038/4 "2022-07-28T05:05:20Z")
The only other thing I can suggest is to reset the printer to defaults, save the defaults, reboot it and try the calibration again. Sometimes things can get messed up in the EEPROM and cause weird behaviour.