# Form 3: Resin tanks (2 of 5) not recognized

**URL:** <https://forum.formlabs.com/t/form-3-resin-tanks-2-of-5-not-recognized/31097>\
**Category:** Form 3/3+\
**Created:** [May 18, 2021, 7:04am UTC](https://forum.formlabs.com/t/form-3-resin-tanks-2-of-5-not-recognized/31097 "2021-05-18T07:04:36Z")\
**Posts on this page:** 2\
**Page:** 1

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**Author:** ![schpongo](https://avatars.discourse-cdn.com/v4/letter/s/58f4c7/32.png) [@schpongo](https://forum.formlabs.com/u/schpongo)\
**Post date:** [May 18, 2021, 7:04am UTC](https://forum.formlabs.com/t/form-3-resin-tanks-2-of-5-not-recognized/31097/1 "2021-05-18T07:04:37Z")

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Hi, I’m still very new to using the Form 3 and SLA printing. Thus I apologize in advance if I’m overseeing something very obvious.

I have a Form 3 which is running the latest Firmware to date (18.05.2021, FW:rc-1.12.2-672). Currently I have 5 tanks (a mix of V2 & V2.1), three of these (again a mix of V2 and V2.1) are working perfectly fine. The remaining two (again a mix of V2 and V2.1) are not recognized by the machine.

Here is what I’ve tried so far:

- Inserting and removing the tanks several times \> 20. But neither one of the tanks was ever recognized.
- I’ve cleaned the electronic contact points on the Form 3 and the tanks with a paper towel and alcohol. But this also did not help. I also feel confident that the tanks are making electrical contact as one can see very slight abrasive marks on the golden contact patches of the tanks
- I’ve restarted the machine

I also feel confident that I’m inserting the tanks correctly as the other three tanks are recognized without any problems.

I would be very grateful for any advice.

Greetings  
Daniel

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**Author:** ![asalamancal](https://sea1.discourse-cdn.com/flex025/user_avatar/forum.formlabs.com/asalamancal/32/17742_2.png) [@asalamancal](https://forum.formlabs.com/u/asalamancal)\
**Post date:** [May 19, 2021, 11:10am UTC](https://forum.formlabs.com/t/form-3-resin-tanks-2-of-5-not-recognized/31097/2 "2021-05-19T11:10:25Z")

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I also had a similar issue, 3 out of 5 brand new tanks were not detected by my Form 3. I contacted Formlabs support and the faulty tanks were replaced.