TU501-x
Short Guide TU501-x v4.2, May 2019, ©Trackunit 201910
Troubleshooting
Error description
Possible solutions
No reply on SMS command
•Verify correct GSM number
•Check LED status – see page 6
No light in LED
•Check if the red and blue wires are installed correctly or
if the fuse is blown
Constant red light
in LED
•Verify location of the unit – see page 3
•Move machine or vehicle for better GSM signal
No green light in LED
•Verify location of the unit – see page 3
•Move machine or vehicle for better GPS reception
Inputs counting operating
hours when machine is off
•Possibly due to the main breaker being on the negative wire (ground
wire from the machine battery). When off, the inputs may register a
voltage level and start counting operating hours.
•To avoid this situation, the digital input 4 (pink wire) should be
connected to the chassis/ground on the machine.
•See Input filtering (INFILT) section, page 8.
Technical Assistance
If you experience an issue and cannot find the information you need in the product documentation, please
contact Trackunit.
Trackunit support: +45 96 73 74 00
Email: support@trackunit.com
The guides can also be downloaded online: www.trackunit.com/downloads
NB! When contacting technical support, please have the unit serial number ready.
