"Diezmon" wrote in message
...
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.




With the solenoid valves open manually the pump may still not be called upon
to start. You may only be feeling heat due to gravity fed convection of
water in the pipes. With both valves open, the pump may not have the
capacity to serve both zones, try closing one valve. Turn the thremostat up
or down to see if you can hear a relay click in the heater or a difference
in the pump noise or vibration.

Sure sounds like the pump is not doing the job. You can check to see if AC
is sent to it and you should still be able to tell if it is running by feel
or by peeking in a vent hole in its case.

Often the pump motor is connected to the pump impeller by a spring and arm
mechanism. It absorbs startup shock when the motor kicks in but if the
springs break, the motor will spin but the pump will be still.

The pump motor and pump (impeller) itself should be considered seperately
when troubleshooting because either can fail independent of the other even
though they look like one unit.