After downloading TruTech_Setup.exe:
The download is useless if you can’t connect. Here are the three common connection methods: carrier tru tech download
Even after a successful Carrier Tru Tech download, you may face problems. Here is your troubleshooting cheat sheet: After downloading TruTech_Setup
| Problem | Likely Cause | Solution |
| :--- | :--- | :--- |
| "No License Found" | Dongle not inserted or driver failed. | Unplug and replug dongle. Reinstall dongle driver from the Drivers folder. |
| Connects but no data (stars go up/down) | Incorrect Baud rate or parity. | Change COM port settings in Windows Device Manager to match the chiller (often 19200 baud for newer units). |
| Blue Screen of Death (BSOD) | Old RS-232 adapter driver conflict. | Buy a high-quality FTDI chip-based USB-to-Serial adapter (e.g., Tripp Lite or OMNI). Avoid $5 adapters. |
| "Runtime Error 13" | Mismatched Windows regional settings (decimal vs comma). | Go to Control Panel > Region > Additional Settings > Set Decimal symbol to "." (period). |
| Software crashes on launch | Windows Defender blocked a .dll file. | Reinstall software while Defender is off. Add C:\Carrier folder as an exclusion in Windows Security. | | Unplug and replug dongle