# Using Servo errors **URL:** \ **Category:** Robot Hardware\ **Created:** [October 31, 2025, 5:15am UTC](https://xrp.discourse.group/t/using-servo-errors/880 "2025-10-31T05:15:32Z")\ **Posts on this page:** 3\ **Page:** 1
**Author:** ![s.dziuba](https://avatars.discourse-cdn.com/v4/letter/s/c89c15/32.png) [@s.dziuba](https://xrp.discourse.group/u/s.dziuba)\ **Post date:** [October 31, 2025, 5:15am UTC](https://xrp.discourse.group/t/using-servo-errors/880/1 "2025-10-31T05:15:32Z")
Hi! I started testing the servo. At first it was on port 1, everything worked, then I switched it to port 3 - everything worked, on port 4 - everything works, but when I put it on port 2 - it doesn’t work. When I returned the servo to port 1 - it also stopped working. As a result of my experiments - now ports 3 and 4 work, ports 1 and 2 do not work. I use the block environment for programming. What can I do? ---
**Author:** ![SparkFro](https://yyz1.discourse-cdn.com/flex011/user_avatar/xrp.discourse.group/sparkfro/32/12_2.png) [@SparkFro](https://xrp.discourse.group/u/SparkFro)\ **Post date:** [October 31, 2025, 3:57pm UTC](https://xrp.discourse.group/t/using-servo-errors/880/2 "2025-10-31T15:57:16Z")
Hi there, That’s odd behavior. What servo are you using? Do you have another servo you can test with? Do you have another control board you can try? Can you double check the servo header is plugged in correctly (black to GND)? Could you please share a screenshot of the code you’re using to test? ---
**Author:** ![s.dziuba](https://avatars.discourse-cdn.com/v4/letter/s/c89c15/32.png) [@s.dziuba](https://xrp.discourse.group/u/s.dziuba)\ **Post date:** [November 3, 2025, 10:36am UTC](https://xrp.discourse.group/t/using-servo-errors/880/3 "2025-11-03T10:36:24Z")
Hi! Today I tested all 4 ports, all ports work. We bought new XRP and are just starting to work with them. Maybe I did something wrong the first time.