switching from an old Honeywell T87F (dial type) thermostat.... on th old tstat it was:
Wire - Terminal Red - R White - W Green - G Yellow - Y Grey - B (but this wire wasn't connected to the transformer on th other end)
I tried just using the recommended wiring scheme that honeywell's sit said, which is the same as above with the exception of the B termina and the Grey wire. No go, wouldn't turn on the fan, heat, or A/c unit
there is a common terminal on the transformer that doesn't have a wir connected from the set that goes to the thermostat (the grey wire i just taped back and not in use). i tried hooking that grey wire to th common terminal on the transformer (in the furnace) and connecting tha to the C terminal on the backplate, but still no dice.
any advice would be great. thanks
-- midnight