EWC Controls Forum

I have a ewc ncm 300 controler 3 zone system , stat in basement,stat on 1st flr,stat on 2nd flr,when stat and zone valves on 1st flr and 2nd flr call for heat zone valves open for each, when basement stat is used it opens zone valves on the 1st and 2nd floors and nothing happens to basement zone ...