Intermittent Operation: Failed Zone Board

We find a Lennox Ac and Furnace with intermittent operation issues. While attempting to troubleshoot, we notice the system contactor "Chattering" and trace it back to a faulty zone board. We'll be going over some trouble shooting and tips and tricks to find and resolve the problem. Video is for educational and entertainment purposes, any attempted "Do It Yourself" you "Did Yourself!" ECW Zone Board PDF: https://ewccontrols.com/acrobat/090375a0226.pdf HZ311 Board PDF: https://digitalassets.resideo.com/damroot/Original/10014/69-2069EFS.pdf --- Video Contents --- 00:00 Introduction 02:04 Troubleshooting Condenser 03:10 Trouble Shooting Zone Board 04:25 Bypassing Zone Board To Operate as Single Zone 05:23 What Is A Zone System? 06:11 Installing New Zone Board 09:43 Purge Cycle and Confirming Operation 10:41 Conclusion