Below are 2 different scenarios, one is a broken pull chain and one is a bad switch. Always turn off power before taking apart a ceiling fan or light switch. Pull chain for a ceiling fan light switch. To replace the fan light switch pull chain: 1  The switch housing needs to be removed.2  Unscrew the screws holding the lighting assembly to the fan. 3  You should now see the light switch and where the pull chain has broken. 4  Unscrew the pull chain assembly from the switch.lways turn off power before taking apart a ceiling fan or light switch. Pull chain for a ceiling fan light switch. To replace the fan light switch pull chain: 1  The switch housing needs to be removed. 2  Unscrew the screws holding the lighting assembly to the fan.