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Hello guys, my Avalon 921 report at ECHU status the code 131073 instead of 0 0 0 0 it says 131073 131073 131073 131073. I know that it's the hashboard's but i want to know if PMU's failed may cause this? the voltage for the PMU's are correct. Can the hashboard's be right and be something else? all others info at the API log looks correct.

Hi, please see my troubleshooting guide for the Avalons.
The link is in my signature space, as are also my other guides.
(https://bitcointalk.org/index.php?topic=3224256 )

The guide is also somewhat applicable for 9/10/11/12 series Avalons.

Edit: I remember explaining that same ECHU code for someone, and I found my old post here: https://bitcointalk.org/index.php?topic=5325107.msg57013711#msg57013711

Thanks for your answer. I had read it but i wonder how is this possible, i mean that MW0, MW1, MW2, MW3 not working. Can be the PSU?

If you have another psu, I would give it a test.

Unfortunately all my spares are burned.

Maybe buy one for a spare,
even if it doesn't fix the avalon problem,
you can have it as a future spare part.

Yeah i will buy one.

I have one more question, i have some A921 new fans but it is 12V 9A instead of 12V 4.68A. I know that if it is below the factory specs there will be problems for sure. it is right to use them? i mean the new ones 12V 9A?

Should not matter for the most part so long as they are moving the correct amount of air (CMF) or more at the RPM that the miner is expecting.
What model fan did you get to replace the stock ones? And why?
The stock ones that they used, were at least for me and the people I know, just about indestructible vs the ones from other miner manufacturers.

-Dave

As it is an 9 Amp fan, I would make sure the power wires are thick enough.
Probably you wont have fans at 100 percent pulling the max. current all the time,
but for a while they can be at 100 percent speed.

Thank you guys.