A MicroSmart controller is not communicating and the red watchdog timer (WDT) LED is on solid.

Issue

A MicroSmart controller is not communicating and the red watchdog timer (WDT) LED is on solid.

Product Line

TAC I/A Series

Environment

DMS

Cause

Possible hardware issue or power issue

Resolution

Things to try:

- Power cycle the controller

- Verify it has a good earth ground and 24 Vac

- Hardware clear the controller

- Replace the line driver and disconnect the communications trunk

- If it is a MSC-MPC, remove all modules.  If the WDT LED begins flashing normally, re-connect the modules one at a time until the WDT LED goes solid

 

On-board hardware issue.  Replace with another controller