| No sound when probe in water. | Reading conductivity too high. | Restore default factory settings following the instructions above. | 
                    
                        | No display, blank screen. | Dead battery. | Replace 9V alkaline battery. | 
                    
                        | Wire disconnected on faceplate. | Check all connections inside reel for loose/disconnected wires - solder or reconnect. | 
                    
                        | Conductivity and temperature readings are inaccurate/ bouncing. | Probe is dirty. | See cleaning instructions on Page 1. | 
                    
                        | Reading conductivity inaccurately. | Restore default factory settings following the instructions above. | 
                    
                        | Calibration needed. | Calibrate the probe following the instructions above. | 
                    
                        | "No Comm" always displayed. | Probe connection. | Ensure probe is properly connected to tape seal plug and that there are no leaks. | 
                    
                        | Broken wire in tape. | Locate break in tape - splice and seal. (Contact Solinst) | 
                    
                        | Wire disconnected on faceplate. | Check all connections inside reel for loose/disconnected wires - solder or reconnect. | 
                    
                        | Display reads "999.9M" | Conductivity over-range. | Contact Solinst. | 
                    
                        | TLC 3.00 will not disappear. | Wires reversed on faceplate or probe. | Reverse the tape leads at the push-release fittings on the circuit board, or at probe. |