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by Jim59
Sat Jul 10, 2010 4:00 pm
Forum: Help and Advice
Topic: Troubleshooting EWC-ST-2D
Replies: 1
Views: 7236

Troubleshooting EWC-ST-2D

Greetings, I've been having an intermittent zone control problem with the cooling operation of my HVAC system using an Ultrazone EW-ST-2D. All wiring and thermostats are as they have been since the system was first wired and appear to have been correctly wired per your documentation. Essentially ...