One fan speeds reads zero

[chocoboman]

sensors


coretemp-isa-0000
Adapter: ISA adapter
Core 0: +69.0°C (high = +89.0°C, crit = +105.0°C)
Core 2: +67.0°C (high = +89.0°C, crit = +105.0°C)

f71858fg-isa-0a00
Adapter: ISA adapter
+3.3V: +3.34 V
3VSB: +3.33 V
Vbat: +3.28 V
fan1: 754 RPM
fan2: 1274 RPM
fan3: 0 RPM ALARM
temp1: +42.0°C (high = +70.0°C, hyst = +60.0°C)
temp2: +50.5°C (high = +100.0°C, hyst = +85.0°C)
temp3: +59.1°C (high = +100.0°C, hyst = +85.0°C)
I'm using Ubuntu 12.04 on an HP desktop.
Any help?

[miegiel]

Is there a fan connected (to fan connector 3 on the motherboard)?
Is the fan really not turning?


Some fans to turn off when the CPU or motherboard are cool enough.

[chocoboman]

Is there a fan connected (to fan connector 3 on the motherboard)?
Is the fan really not turning?

There are three fans, but they are all working... \: