# Q: The readout is not accurate when ITC-100 is connected to K probe/PT100

**URL:** <https://community.inkbird.com/t/q-the-readout-is-not-accurate-when-itc-100-is-connected-to-k-probe-pt100/105>\
**Category:** Questions & Answers\
**Tags:** smart-controller\
**Created:** [October 15, 2021, 9:10am UTC](https://community.inkbird.com/t/q-the-readout-is-not-accurate-when-itc-100-is-connected-to-k-probe-pt100/105 "2021-10-15T09:10:53Z")\
**Posts on this page:** 3\
**Page:** 1

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**Author:** ![INKBIRD](https://yyz1.discourse-cdn.com/flex031/user_avatar/community.inkbird.com/inkbird/32/366_2.png) [@INKBIRD](https://community.inkbird.com/u/INKBIRD)\
**Post date:** [October 15, 2021, 9:10am UTC](https://community.inkbird.com/t/q-the-readout-is-not-accurate-when-itc-100-is-connected-to-k-probe-pt100/105/1 "2021-10-15T09:10:53Z")

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A: Please remove the probe, put the PID in a stable temperature place, then use a wire to connect #3 & #4, set Sn= 0.

Can it read room temperature correctly (there may be ±5℃ difference)?

 ![图片20](https://canada1.discourse-cdn.com/flex031/uploads/inkbird1/original/1X/c9d6c50f82e6136342349d675ee3a937bb56733e.jpeg)

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**Author:** ![Bobhodgson](https://avatars.discourse-cdn.com/v4/letter/b/7feea3/32.png) [@Bobhodgson](https://community.inkbird.com/u/Bobhodgson)\
**Post date:** [March 20, 2022, 3:13pm UTC](https://community.inkbird.com/t/q-the-readout-is-not-accurate-when-itc-100-is-connected-to-k-probe-pt100/105/2 "2022-03-20T15:13:39Z")

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Sorry to jump someone else’s thread.  
But when I do as suggested, above, I get 0.0 as my reading.  
Sn set to zero everything else, as default.

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**Author:** ![Tania](https://yyz1.discourse-cdn.com/flex031/user_avatar/community.inkbird.com/tania/32/88_2.png) [@Tania](https://community.inkbird.com/u/Tania)\
**Post date:** [March 22, 2022, 1:45am UTC](https://community.inkbird.com/t/q-the-readout-is-not-accurate-when-itc-100-is-connected-to-k-probe-pt100/105/3 "2022-03-22T01:45:34Z")

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Hello,  
If your wiring is the same as the example diagram, but the controller reading is far off from room temperature, it may be a problem with the controller.  
If the controller is within the warranty period, please contact the seller with photos of how you wired it and order information so that they can do further after-sales processing.  
Thanks.