The control wiring is wrong. Make a note of the letter designations and
cable colours in the outside Unit and note the letter designations they are
connected to in the thermostat. Compare these with the control wiring of the
downstairs unit and thermostat.
wrote in message
oups.com...
I hope that someone out there can help me. I have just purchased a new
house and I wanted to make sure and swap out the cheap thermostats that
came with it. I have installed the thermostat in both my upstairs unit
and my downstairs unit. My downstairs works like a charm, but my
upstairs is having serious issues. The major issue, is that the freon
pipe freezes up all the way to the outside unit and even when I set it
to 76 or 78. I am in atlanta and it has been in the mid-upper 80's
which the A/C unit should handle.... It seems once that pipe freezes
the air get less cool, but it should freeze so much. It freezes every
day regardless of what temp it is set to. The 2nd issue and this is
what leads me to belive there is something wrong, is that whether it is
on heat or cool, I only get cool air? Any suggestions? I don't know a
great deal about hvac, but I believe it is a single stage heat pump
with no aux. I have my 170 set to 2 and my 190 set to 0. If I set 190
to 1 then I just get room temperature air. Please help me. I have spent
so many hours trying to get this thing right. The most troubling issue
is that the unit downstairs has the same settings, but no problems.
Thanks in advance...