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Frank, it sounds like you're referring to the zone valves. Those arms should be in the down position. In the up position, they will allow flow all the time. Generally the zone valves are used in conjunction with a shut off valve with a hose connector after it on the return just before going back to the circulate valve . Chances are the tech left the shut offs closed and the zone valves open after he bled the air out of your system. Water will not flow through the zones with this condition. Put those arms in the down position and open the shut offs.
That's all I've got to offer without seeing it.
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