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05-30-2013 09:39 AM
05-30-2013 09:39 AM
3Com 3870 3CR17451-91 - FAN not working too fast alarm
Hi
We have some 3870 which are displaying a FAN fault. All 4 Fan's are working but switch has a Fan alarm. If you reset
swith it fails POST on all 4 FAN's:
Fan Speed Test ...............
Fan 1 is not working - speed 09000 RPM -> too fast
Fan 2 is not working - speed 09180 RPM -> too fast
Fan 3 is not working - speed 09000 RPM -> too fast
Fan 4 is not working - speed 09180 RPM -> too fast
FAIL
I have replaced all 4 FAN's from another working unit but same FAIL.
Switch works fine. Would it be power supply maybe?
Thanks
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05-31-2013 12:07 AM
05-31-2013 12:07 AM
Re: 3Com 3870 3CR17451-91 - FAN not working too fast alarm
Hi larry
Too fast fan speed are usually caused by overvoltage. Maybe because a damaed PSU or other electrical part.
br
Manuel
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05-31-2013 08:01 AM
05-31-2013 08:01 AM
Re: 3Com 3870 3CR17451-91 - FAN not working too fast alarm
Hi Manuel
I have now replaced the PSU and still same alarm.
So it must be circuitry on main board.
Thanks
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12-16-2013 06:38 AM
12-16-2013 06:38 AM
Re: 3Com 3870 3CR17451-91 - FAN not working too fast alarm
Up to now my 3COM switches used to report alarms when a fan was not functioning. You would replace the faulty fan and proceed. Even with alarm ON, the switch continued to work.
But now with this 'new' alarm: all fans working too fast, the switch never passes POST!
HP offers no advice/solution. Any advice?
--- Performing Power-On Self Tests (POST) ---
UART Loopback Test ........... PASS
DRAM Test .................... PASS
Timer Test ................... PASS
PCI Device 1 Test ............ PASS
I2C Bus Initialization ....... PASS
Switch Int Loopback Test ..... PASS
Crossbar Int Loopback Test ... PASS
Fan Speed Test ...............
Fan 1 is not working - speed 10680 RPM -> too fast
Fan 2 is not working - speed 09960 RPM -> too fast
Fan 3 is not working - speed 10080 RPM -> too fast
Fan 4 is not working - speed 10140 RPM -> too fast
FAIL
------------------ DONE ---------------------