I've had trouble with lm_sensors not separating cleanly between chip sections,
meaning settings of a previous chip section are picked up for the chip section
you're currently editing. As the main board hardware isn't going to change, it's
best to replace the contents of /etc/sensors.conf completely, but keep the
comments at the top. Like

   mv /etc/sensors.conf /etc/sensors.conf.orig
   mv sensors-XXX.conf /etc/sensors.conf
   rm /etc/sensors3.conf
   
   mv /usr/sbin/fancontrol /usr/sbin/fancontrol.orig
   mv fancontrol-XXX /usr/sbin/fancontrol

Do not paste any text into the file from the browser screen!
Download the file instead.

The fancontrol script is effective only with a correct /etc/fancontrol config
file. Create one by running pwmconfig, and add a THRESHTEMP setting with a text
editor.

 Name                                        Last modified      Size  Description
 Parent Directory                                                 -   
 sensors-PCChips-M810LR.conf                 17-Dec-2005 11:19  1.9K  
 pwmconfig-suse10.0.diff                     08-Jan-2006 13:32  1.0K  
 init_d_lm_sensors-suse10.1beta              11-Jan-2006 11:51  3.3K  
 sensors-Gigabyte-GA-K8NF-9.fancontrol       20-Jan-2006 14:46  341   
 init_d_lm_sensors-suse10.0.diff             04-Feb-2006 09:53  1.6K  
 fancontrol-1.0                              25-Feb-2006 10:57  9.3K  
 sensors-Gigabyte-GA-K8NF-9.conf             20-Jan-2008 22:54   12K  
 INSTALLATION                                03-Jan-2009 10:02  809   
 sensors-Gigabyte-GA-K8NF-9.fancontrol-hwmon 03-Jan-2009 10:08  1.1K  
 fancontrol-1.1                              03-Jan-2009 10:36   13K  
 fancontrol-suse11.1.diff                    03-Jan-2009 10:36   23K  
 modprobe-sensors-hwmon-order                25-Jan-2009 15:14  749