I'm a fan of diagnosing before I attempt a repair, and diagnosing requires you follow a process. Do as Chet suggests and make sure the pump is turning when the unit is calling for heat - you can see the unit is calling for heat in the zone by looking at the LED on the board beside the zone, when it is lit the pump should be turning.
If the pump isn't, you should check voltages to see if the board is sending the voltage, and if you have a bad connection. If it is spinning, do as 38 special advises and see if the hose is hot/not on the far side of the valve from the pump. If it is cold, try tapping the valve.
If that doesn't work (and give it a decent tap), then you need to come back with the info and ask again.
2006 Patriot Thunder C13 Allison 4000
2010 Ford Flex Ecoboost AWD