"jtpr" wrote in message
...
This is a simple system. FHW on Zone 3. Pumps out to the garage,
through a Modine blower unit mounted near the ceiling. It is new this
year. I turned it on, the zone pump fires up, but the pipes
(plastic), never get warm beyond the first few feet of the return and
feed. There is a little valve on the feed side with a grey plastic
turn screw on the top, looks like something to bleed with, but I'm not
sure how it works. I backed it all the way out, but it seems to make
no difference.

The Modine unit never kicks in, but I assume there is a mechanism to
detect heat in the pipes before it does. All is pluged in, the zone
pump just keeps running.

Any ideas where to go from here?



*I would try disconnecting the return line from the blower unit to see if
any fluid comes out. I'm thinking that the coil is full of air and
preventing water from flowing. Have a bucket standing by.