[SOLVED] WRT1900ACv1 Fan Spin Conditions

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sid8tive
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PostPosted: Thu Jul 20, 2017 22:32    Post subject: [SOLVED] WRT1900ACv1 Fan Spin Conditions Reply with quote
Hi All,

I have a WRT1900ACv1 currently running 07-19-2017-r32753. The question I have is not specific to this version. I have been noticing this fan behavior (or lack of it, maybe) for all versions I've tried.

My question: is it normal for the fan NOT to spin? It does do its spin-cycle on power up. My temps stay between 65C-74C depending on ambient temp conditions. Highest I've seen it go is 78C on a very hot summer day. The fan has never come on even once - at least audibly. If its running very slowly, how can I tell? I just want to ensure that this is normal behavior - I don't care much about the temps per se, just normalcy of expected behavior.

Thanks in advance!


Last edited by sid8tive on Mon Jul 24, 2017 20:52; edited 1 time in total
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ATHF
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PostPosted: Fri Jul 21, 2017 4:35    Post subject: Reply with quote
On mine it's usually always spinning, can't hear it unless your temps really get up there as I believe it actually has two speeds or maybe it's a PWM fan (I could be wrong, but that's the way mine seems to work). You could grab a flashlight and shine it down the top of it to check if the blades are moving.
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sid8tive
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PostPosted: Fri Jul 21, 2017 16:35    Post subject: Reply with quote
Thanks @ATHF. Good idea. I will try that and update the thread here.
sid8tive
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PostPosted: Mon Jul 24, 2017 16:41    Post subject: Reply with quote
Okay, so, the fan doesn't spin for me (other than the boot-up spin cycle). I checked with a flashlight too.

Is it possible that its using default Linksys values of 85C as a trigger, and since I've never hit that temp, it has never spun?
myersw
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PostPosted: Mon Jul 24, 2017 16:48    Post subject: Reply with quote
sid8tive wrote:
Okay, so, the fan doesn't spin for me (other than the boot-up spin cycle). I checked with a flashlight too.

Is it possible that its using default Linksys values of 85C as a trigger, and since I've never hit that temp, it has never spun?


On the services tab you can set the high and low temps.

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sid8tive
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PostPosted: Mon Jul 24, 2017 16:56    Post subject: Reply with quote
Thanks, @myersw. They are already at their defaults of 60-65. I've never meddled with the fan defaults.
sid8tive
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PostPosted: Mon Jul 24, 2017 16:58    Post subject: Reply with quote
PS: FWIW, I get the same fan behavior on LEDE, McDebian, as well as Stock.
myersw
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PostPosted: Mon Jul 24, 2017 19:44    Post subject: Reply with quote
Since you know the fan will spinup on powerup and the router is not over heating, I guess I would not worry about it. The fan, as others have noted, can be hard to hear and looking at the fan to see if the blades are turning is the only sure way.
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tutorial for flashing "WRT" series:
http://www.dd-wrt.com/phpBB2/viewtopic.php?t=287813
DD-WRT Installation, Upgrade & Basic Setup–Cliff Notes:
http://www.dd-wrt.com/phpBB2/viewtopic.php?t=311117
Kong DD-WRT Config Tutorial:
http://www.instructables.com/id/Install-and-Configure-a-DD-WRT-Kong-Router/
I tried to be normal once. Worst 2 minutes ever.
sid8tive
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Joined: 20 Jul 2017
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PostPosted: Mon Jul 24, 2017 20:50    Post subject: Reply with quote
Got it. Thanks, @myersw! I'll mark this thread as solved, as nothing much can be done about this Smile
BIOHazard87
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PostPosted: Tue Jul 25, 2017 21:03    Post subject: Reply with quote
You need to set the min/max temps 10-15C lower than default, as it seems recent builds are basing the temperature off of the wireless radio temperatures rather than CPU temperature.

I was getting reboots every so often before I made this change. Lowering temps improved stability of the v1.

I personally use Fan On - 55C, Fan Off - 50C.

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sid8tive
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PostPosted: Tue Jul 25, 2017 21:55    Post subject: Reply with quote
@BIOHazard87 - oh wow. What a great observation! I'll try that and update this thread. Thank you!! Smile
sid8tive
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PostPosted: Wed Jul 26, 2017 17:10    Post subject: Reply with quote
@BIOHazard87 - Your tip worked wonders. You're correct: it does seem to track the WiFi radio (WL0, I think) temps and not the CPU temps. Tweaking the values at 50-55 keeps the fan spinning at very low/inaudible speeds when WL0 is above 55C.
mpouls1
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PostPosted: Fri Jul 28, 2017 5:00    Post subject: Reply with quote
DD-WRT v3.0-r31924 std (05/02/17): Under Services settings high temp at 65 and normal 60. Checked my CPU temperature on status page and notice was 74 and visually inspected that the fan was not spinning. Did as suggested above by BIOHazzard87 and changed to 55 and 50 respectively. Fan is now spinning.
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