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- Fri Nov 30, 2018 2:54 pm
- Forum: Help and Advice
- Topic: Troubleshooting Steps for Zone airflow issue
- Replies: 1
- Views: 4986
Hi, I'm trying to troubleshoot an airflow issue of a 14 yr old house. I have an NCM-300, 2 zones. Zone 1 is upstairs. Zone 2 is downstairs. My downstairs zone seems to have airflow fine. My upstairs airflow has stopped. I checked the duct infront of the flapper, and it was closed, and seems to stay ...