Antminer s15 "input temperature is not stable"

[fyoung55]

Anyone know what that means or ow to fix it?

It keeps happening over and over in my kernel log with a different number each time

Here is the log:

Code:

2020-03-01 13:26:26 driver-btm-soc.c:3731:check_system_work: The avg rate is 28055 in 30 mins, PCB temperature between 28 ~ 68 ideal_hash_rate_fixed 27000
ENV 12 FAN 4980
ENV 13 FAN 4980
ENV 12 FAN 3240
ENV 12 FAN 3240
2020-03-01 13:41:43 driver-btm-soc.c:3834:check_system_work: input temperature is not stable 1.0.
ENV 13 FAN 3300
ENV 17 FAN 4500
2020-03-01 13:57:00 driver-btm-soc.c:3731:check_system_work: The avg rate is 27983 in 30 mins, PCB temperature between 30 ~ 69 ideal_hash_rate_fixed 27000
ENV 15 FAN 4140
ENV 17 FAN 5040
2020-03-01 14:02:06 driver-btm-soc.c:3834:check_system_work: input temperature is not stable 1.1.
ENV 13 FAN 5040
ENV 17 FAN 3300
ENV 12 FAN 3240
ENV 12 FAN 4980
2020-03-01 14:27:34 driver-btm-soc.c:3731:check_system_work: The avg rate is 27865 in 30 mins, PCB temperature between 28 ~ 68 ideal_hash_rate_fixed 27000
ENV 12 FAN 3240
ENV 17 FAN 5040
ENV 13 FAN 5040
ENV 17 FAN 3780
2020-03-01 14:42:52 driver-btm-soc.c:3834:check_system_work: input temperature is not stable 1.0.
ENV 12 FAN 5040

[mikeywith]

Anyone know what that means or ow to fix it?

What do you need to fix exactly? if the miner is hashing just fine then there is nothing to fix, I am not familiar with the kernel log of S15 but fan speed adjustment is pretty normal, the room gets hotter the fans have to spin faster, they spin faster the miner cools down, fans slow down and this keeps ongoing as long as you don't have a perfect ventilation system. It happens to almost all of the miners I have, to avoid this, and to keep the miners as cool as possible I always set static fan speed of 90% and above.

[fyoung55]

The issue is, the miner thinks it's "too cold" and bumps up voltage to warm hash boards.  Pulls down an extra few 100 watts which I don't like.  Also, it's the locked firmware so I have 0 control over fans, voltage, or freq.

Hahaha, problem solved.  I just closed down the intake a bit with an air filter to keep hash boards above 30 degrees.  Runs almost dead on to the specs listed at bitmain.  Who the hell thought a miner could be too cold?!?!

[mikeywith]

The issue is, the miner thinks it's "too cold" and bumps up voltage to warm hash boards.  Pulls down an extra few 100 watts which I don't like.  Also, it's the locked firmware so I have 0 control over fans, voltage, or freq.

You can always use one of these tricks to gain access to the fan settings, and sometimes a few more other options.

blocking a part of the fan might damage the chips behind the blocked part, this is the reason why almost 99% of the time it's the chip behind the fan motor that gets toasted, well using an air filter is not as bad as blocking the whole thing, but I would still be careful, it would be safer to actually set a static fan speed in my opinion.

Anyway thanks for following up, most people don't, gave you a merit for that.