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The 3 way valve was replaced arround September 2006, and everything seemed fine. The room stat failed early November and was replaced. The old stat was a mechanical one with a 2 wire connection the new one is electronic with 3 wires so i had to run a neutral from the terminal box to the stat...

Has anyone got any ideas. When the hot water is calling for heat and the room stat is off the rads still get hot. Once the hot water is back up to temp the system works fine. If i check the 3 way valve operation by turning to turning the room stat down i can here the vavle operating