Question:  

Why does my Fluke 233 show "rF Err" on the display?

Answer: 

         If the radios in the Meter base and display module do not connect, rF Err flashes in the display. Dock the display module with the Meter base and turn the Meter off and then on. When the Meter is turned on, the red high voltage LED on the Meter base flashes. If not, replace the Meter base batteries. For maximum battery life, dock the display module to the Meter base when the Meter is off. If the problem persists, please contact Fluke Service (service@fluke.com. 888-993-5853) for information on the repair process.