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THanks to Stem and apologies for hijacking, sounds bad...... just seemed sensible to follow the theme but thanks for putting me right. A

i read with interst this thread, as I want to do the same, to upgrade my 699 to a 9400 to allow me to use boost feature to save heating costs. but looking at the photo of the backplate, I notice that i have no wire on the no7 terminal. is that normal, its one of the HW terminals. my heating and...