Have an older round Honeywell Stat with 5 wires, G,Y,W,R, RH. I have hot water heat (no fan) and a Central AC with air handler.
New stat has terminals for G,Y,W,R,RC. Question is does the RH from the old stat go to R or RC on the new stat? I assume that R would go to the remaining one. I tried R to R and RH to RC and it's not working.