we have an CCR1036-12G-4S which is shutting down fans to 0RPM and spins them up after some seconds. The configuration is:
/system health
set cpu-overtemp-check=yes cpu-overtemp-startup-delay=1m cpu-overtemp-threshold=100C fan-mode=auto use-fan=main
An other CCR1036-8G-2S+ is keeping the fans running all the time
The configuration:
/system health
set cpu-overtemp-check=yes cpu-overtemp-startup-delay=1m cpu-overtemp-threshold=100C fan-mode=auto use-fan=main use-fan2=main
Both have temp of 40C and CPU Temp of 55C which looks ok to me.
Is this normal that 2 different CCR models behaves different on the same configuration or is there a problem with the first CCR that the fans will fail soon?
Is there a hidden wiki page showing the fan configuration options? as I really can’t find anything useful about this…
Not sure as to the behaviour of the fans, but I suspect the reason that the CCR1036-12G-4S isn’t showing the fan2 stuff is that it doesn’t have a 2nd fan.
At least thats what I am can gather from the innards of the two routers.
The CCR1036-12G-4S shows decent RPM (around 3000RPM) for both fans (fan1-speed and fan2-speed) but sets one or both fans to 0 RPM randomly every 1-5 seconds.
one in the PDF is a CHR without case that can be purchased. If the CCR is in rackmount case, it has several fans. And, these are different products, different PCBs etc.
It’s a bit sad that a support member showed up and completely ignores the original question.
A simple “Yes, this is intended and your fans are fine” or an “no this is not intended, there is something wrong with your CCR” would cost 20 seconds and should be really easy for mikrotik employees?!
Three years later I arrive at this thread with a similar problem on a CCR1016-12S-1S+. It has two fans which literally vanish from the System Health window on winbox. Then they reappear at 4000RPM ramping quickly up to 8000 then vanish again.
I’d suspect a hardware failure but the only official answer is a driveby correction post from a Mikrotik employee. I keep buying these plastic routers thinking it’ll be different this time.
I have quite a few of the original CCR1036-8G-2S+ routers. All came with Fan1 (right side when viewing router from the front) connected to jumper Q135. Fan2 was connected to jumper D131. Fan mode auto, both fans set to main (defaults). Fan2 stays at 0 RPM, unless Fan1 fails - and Fan2 remained at 0 even when CPU temp hit 100C (causing router to shut itself down until CPU cooled off, in an endless cycle)! The reason CPU hit 100 was because enclosing rack fans shut down when rack temp sensor failed; the whole rack was an oven. I found afterward Fan2 had not failed.
I found after the incident above that moving Fan2 to jumper Q132 let both fans run at a modest 4k RPM (Fan1 previously ran 50% faster under normal box temp conditions), and actually did a better job of cooling the CPU. With factory connections CPU runs 57-58C (mostly right at 58); with both fans running, CPU rarely hits 58C, running between 56-57C.
I’m not advocating for everyone changing factory connections without consulting Mikrotik. I have a bunch of these older models, well past warranty, and plenty of spares. I’m just keeping my well-loved old workhorses happier. They can route a WISP-pleasing 20 Gbps all day long, leaving me some breathing room for firewall rules and CPU-heavy XORs and such.
Speaking of… you have GOT to get your hands on some CCR2216’s. With Fast Forward and L2 +L3 HW offload to that wonderful Marvell ASIC - OMG!
