Antminer s7 defective fan 3 or something else?

[pamamolfx]

Hello

I got a few days ago from Batch 9 a few antminers S7 4,73 and all working great until today that one of them start blinking red light and hear a beep sound every 1-2 seconds....

The configuration is default as i just change only the username for the antpool and never change anything else.

I notice that the s7 connects to the antpool and start mining at 1TH and then 2Th and goes up and after about 4TH goes back to zero.

Then i just notice that then fan 3 speed is 906 rpm only as the rest of my adminers has more than 4.000 rpm for fan 3....

Do you think the problem is the fan (the one that takes out the heat without the metal in front) or something else?

I already contact Bitmain and i am waiting for instructions but i am just asking also here for opinions

Thank you

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[philipma1957]

Well you could swap the fan to a good miner.

Pull the good fan from the good miner leave it aside.

Pull the bad fan and put it on the good miner.

If it works the issue is not the fan.

If the problem moves to the good miner it is the fan.

You are better off that the fan is bad.

If the bad fan works fine  once swapped you most likely have an issue with the controller.