Ok guys I've been googling up the wazoo today to try to figure this out.

I have a two zone system, upper and lower. Gas furnace, one pump(Grundfos
Type UP 15-42F), two valves(Honeywell V8048E), and baseboards.

here she is: http://www.diezfamily.us/images/bs/AUT_2702.JPG

I thought I had frozen lines but when I bleed the zones water flows just
fine. So I followed the procedures to purge each zone and started the
system back up.

Well, I still only have heat to PART of the upstairs zone and no heat
downstairs. I'm at a loss what to try next. The thermostats are working,
the solenoids/valves are working, the aquastat is working, all manual valves
are open, PSI is good(15). I can feel the pipes are nice and hot coming out
of the furnace but they go into the concrete so it's hard to trace.

Actually, downstairs there is a little in a baseboard about 4 feet from the
furnace, but that's it. And, to make things even more fun.. the first floor
pipes are in the concrete floor so I can't get to them or trace their exact
route! grrrrrrr. I think this one warm baseboard is the first unit off the
furnace..

Can it be my pump is dying and can't get the whole system flowing? The
thing is so quiet I can't tell if it's on or off.. It's a Grundfos Type UP
15-42F, by the way.

What else can I try???

Thanks,

T-- (thank God for gas fireplaces!)

Please reply to group.. I'm trying to remain spam-free.