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- Mon Sep 01, 2025 3:02 pm
- Forum: Help and Advice
- Topic: Swapping out an ST series zone control to model NCM-3z zone control
- Replies: 0
- Views: 32
Swapping out an ST series zone control to model NCM-3z zone control
In a similar situation to other threads here , I fell into the trap of purchasing Nest thermostats only to find out my zone control board (ST-2E) was not compatible. I ordered an NCM-300 upgrade board and had planned to perform the upgrade following the appropriate technical bulletin . However, I ...