<p><em>Why is my AntMiner S5 chain only intermittently operational?</em></p>

<p>It's due to hardware failure.</p>

<p><em>Will BitmainTech replace it for me?</em></p>

<p>Yes, I had the same issue. I had to pay to ship it back to them, and they very promptly shipped back a replacement board.</p>

<p><em>How do I know if it's under warranty?</em></p>

<p>Ask them. They're able to figure it out for you.</p>

<p><em>Is there a warranty?</em></p>

<p>Yes, I believe it's 3 months (90 days).</p>

CC BY-SA 3.0
2015-10-23T06:13:18.073Z
2015-10-23T06:13:18.073Z
Geremia
<p><a href="https://bitcointalk.org/index.php?topic=1033277.msg11450591#msg11450591" rel="nofollow">Someone</a> suggested:</p>

<blockquote>
  <p>And first look through -
  <a href="https://bitmain.zendesk.com/hc/en-us/articles/204875015-How-to-diagnose-S5-hashing-PCB" rel="nofollow">https://bitmain.zendesk.com/hc/en-us/articles/204875015-How-to-diagnose-S5-hashing-PCB</a></p>
  
  <p>Then if needed try -
  <a href="https://bitmain.zendesk.com/hc/en-us/articles/203559969-My-S5-hashes-at-about-600GH-S" rel="nofollow">https://bitmain.zendesk.com/hc/en-us/articles/203559969-My-S5-hashes-at-about-600GH-S</a></p>
</blockquote>

<p>Oddly, I unplugged the "Power Cable to Control" (with it still running), which cut the power to it, and plugged it back in. I also sprayed the Chain #2 board with some electrical contact cleaner, and that helped. Now the little red light on that board is on!</p>

<p>Update: But the it's no longer on now! ☹ It just shows: "------ -------- -------- -------- " in the "ASIC status".</p>

CC BY-SA 3.0
2015-05-26T03:08:48.360Z
2015-05-26T03:14:06.780Z
2015-05-26T03:14:06.780Z
Geremia
<p>Why is my AntMiner S5 chain only intermittently operational? What could cause this, how could I diagnose it, and what is the solution? Will BitmainTech replace it for me? How do I know if it's under warranty? Is there a warranty?</p>

<p><img src="https://i.sstatic.net/Eyzta.png" alt="AntMiner S5 dead chain"></p>

<antminer>
AntMiner S5 chain #2 intermittently operational
Geremia
# AntMiner S5 chain #2 intermittently operational

(Asked by: username_0 on 2015-05-25)

Why is my AntMiner S5 chain only intermittently operational? What could cause this, how could I diagnose it, and what is the solution? Will BitmainTech replace it for me? How do I know if it's under warranty? Is there a warranty?

![AntMiner S5 dead chain](https://i.sstatic.net/Eyzta.png)

**Tags:** antminer


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## 2 answers

### Answer by username_0 on 2015-10-23. Score: 1 | Accepted answer

*Why is my AntMiner S5 chain only intermittently operational?*

It's due to hardware failure.

*Will BitmainTech replace it for me?*

Yes, I had the same issue. I had to pay to ship it back to them, and they very promptly shipped back a replacement board.

*How do I know if it's under warranty?*

Ask them. They're able to figure it out for you.

*Is there a warranty?*

Yes, I believe it's 3 months (90 days).


---

### Answer by username_0 on 2015-05-26. Score: 0

[Someone](https://bitcointalk.org/index.php?topic=1033277.msg11450591#msg11450591) suggested:

> And first look through -
> <https://bitmain.zendesk.com/hc/en-us/articles/204875015-How-to-diagnose-S5-hashing-PCB>
>
> Then if needed try -
> <https://bitmain.zendesk.com/hc/en-us/articles/203559969-My-S5-hashes-at-about-600GH-S>

Oddly, I unplugged the "Power Cable to Control" (with it still running), which cut the power to it, and plugged it back in. I also sprayed the Chain #2 board with some electrical contact cleaner, and that helped. Now the little red light on that board is on!

Update: But the it's no longer on now! ☹ It just shows: "------ -------- -------- -------- " in the "ASIC status".


---

