New to Me M21s with a ton of fan issues/codes

[jtlpowersports]

Hello! First post here but having some trouble with an M21s that just came to me. Previous owner installed a new fan and control board and couldn't get rid of the errors so he gave up.

Codes are (111,130,131,600,351,352)
Any suggestions would be greatly appreciated, kinda stumped on this one as the fan spins.

[1715018276]

1715018276

[1715018276]

1715018276

[1715018276]

1715018276

[BitMaxz]

Almost all error are related to fans and a few of them is your two hashboard related to temperature protection.

I think the fan that the previous owner replaced might be defective replacing it with a known working fan might solve the issue.

And I suggest you download the error code descriptions here https://www.whatsminer.com/server/manual.html?locale=en
So that you know what are those error codes.

[NotFuzzyWarm]

For miners with fans on both ends of them, just because a fan spins does not mean it is working. Air being moved by the working fan will make a dead fan spin but of course the dead fan is not actually helping to move the air and in fact slows it down a bit.

[HagssFIN]

I suppose the fan model should be Delta PFC1412HE-00, like it is also for Whatsminer M20S .

Any less powerful fan model will be insufficient for it.

[mikeywith]

Codes are (111,130,131,600,351,352)
Any suggestions would be greatly appreciated, kinda stumped on this one as the fan spins.

111 and 131 = outlet fan issues, it's either spinning too slow or the RPM signal isn't there or both.
130 = intake fan speed error
600 = high temp
351 and 352 = 2nd and 3rd hash board overtemp


I think it's pretty clear by now that you need to replace both fans with proper working ones, unfortunately, a bad PSU can very well cause this issue, anyway when you buy the fan make sure you buy the one with the correct connector depending on the PSU type, P21 PSU and P21d both work on the M21s but have different fan plugs, one is flat another is square-shaped.

If you couldn't locate the fans and or PSU nearby, reach out to grace on telegram @gracezhou1993, she is my number 1 source for all MicroBT spare parts, keep in mind both the fans and PSUs of this model are a bit expensive compared to the other miners.

[jtlpowersports]

Thanks for the help guys. I noticed the one fan is a .7A version as opposed to 7.2A on my other machines. Im gonna slowboat some fans from china and pray. I may just grab a PSU as well

[HagssFIN]

Ouch. So I think it is safe to say that the previous owner did not have any idea about the requirements for the replacement fan.
And even worse, he probably did not test the unit after he installed that new fan.

Maybe meanwhile you can double-check that it can be fixed with a correct fan model, by borrowing a working fan from one of your other units?

[jtlpowersports]

Ouch. So I think it is safe to say that the previous owner did not have any idea about the requirements for the replacement fan.
And even worse, he probably did not test the unit after he installed that new fan.

Maybe meanwhile you can double-check that it can be fixed with a correct fan model, by borrowing a working fan from one of your other units?

Ya I was debating doing that, but it seems like any time I mess with one of these I break it so I was trying to avoid it.

[HagssFIN]

Btw, since you mentioned that the correct fan model is a 7.2 Amp one, I suppose it is this one from the same manufacturer that MicroBT has used for other Whatsminer model fans. Fan type KZ14038B012U.

I found a listing here https://www.ebay.com/itm/234264062523
(equipped with a 6-pin cable)

But you can also use the Delta one that I mentioned about earlier, considering you have Delta model both as a input fan and as output fan.

[jtlpowersports]

I ordered a delta with the fastest shipping I could find, hopefully it fixes my issue!

[jtlpowersports]

Just wanted to follow up, cant believe how simple this fix was. It was the front fan, dunno how I missed it but the wires were switched at the factory. Re-pinned it to the correct spec and she took off like nothing ever happened.

[HagssFIN]

Thanks for the follow-up and glad to hear that the fix was so simple!