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I bought a house back in March (forclosure). The house has 3 zones, 1st zone is the main first floor, the second is a first floor family room addition, and the third is the second floor.
Since day one the heat on the second floor never worked. Since winter is coming soon I decided to have it checked out. A plumber came and drained the system and replaced the head for the zone valve but its still not working. We found out that the supply and return lines run in exterior walls. The piping at the second floor when it enters the second floor is extremely hot but the temperature cools down quickly 10 ft into the run. The plumber thought the line was partially frozen and would eventually unblock but that hasnt been the case.