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I've had my 8 s9's for about 6 months now so far I've had to change 1 control board and from what it looks a second one will be going out soon as well as 1 hashing board that I have to send for repair now and not to mention that 2 or 3 ( don't remember) s9's have completely failed on me , that was within the guarantee time so I got them repaired for free but at the same time I had to pay around $70 to send each unit back by EMS and wait for about a month and a half to get it back. It took them around 2-3 weeks just to confirm that they've received them. Now that they have a repair center in the U.S I'm sure that things might be faster but I don't know.
In my case from what it looks the control boards keep going out when the electricity keeps getting shut off very often or because of spikes, I think it can even brake just from some static electricity so I wouldn't recommend you touching it too much. It is important to have a good power supply so don't be stingy and get a good one right away or it will cost you more later and having an extra power supply is a good idea as well as having an extra control board so that if one of these 2 brake you won't loose BTC, waiting or even looking for them. Waiting for some parts or for your unit to get repaired is the worst thing! I hope I didn't discourage you too much but it is the reality. I keep my miners as cool as I can but where I'm located even with a special cooling system I can only have the room temp at around 27c and max I try not to get it go beyond 31-32c and I can tell you that at 27c they seem to work a lot more stable and even put out more hash.
Hope that helped! Happy mining!
In my case from what it looks the control boards keep going out when the electricity keeps getting shut off very often or because of spikes, I think it can even brake just from some static electricity so I wouldn't recommend you touching it too much. It is important to have a good power supply so don't be stingy and get a good one right away or it will cost you more later and having an extra power supply is a good idea as well as having an extra control board so that if one of these 2 brake you won't loose BTC, waiting or even looking for them. Waiting for some parts or for your unit to get repaired is the worst thing! I hope I didn't discourage you too much but it is the reality. I keep my miners as cool as I can but where I'm located even with a special cooling system I can only have the room temp at around 27c and max I try not to get it go beyond 31-32c and I can tell you that at 27c they seem to work a lot more stable and even put out more hash.
Hope that helped! Happy mining!
Thats great, very useful information. Much appreciated. Its not put me off, but I do have a spare 3kw UPS system laying about, I'll run it through that, along with a good PSU. My room temp is around 27deg C here. Windows open trying to keep the office cool, and that just with 1 x S5, lol. Going to be a different climate with the S9, good job its winter coming.
, will certainly be an upgrade from the S5 i'm running. Elected to pay via USD transfer (as not enough bitcoins yet), so must nip to the bank within 7 days to get that completed 
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