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Zone valve / controller trouble
Background: I've got a 4 zone system, with a Taco ZVC405-4 controller, old Honeywell "gold" valves, and Honeywell RTH2300B thermostats. Over Thanksgiving, the basement valve motor stopped opening all the way: it would open the valve but not hit the relay. The motor was extremely hot. I replaced the motor and everything was worked again.
Problem: Last night, I noticed the house was cold- I went downstairs and 3 of the 4 zones were doing the same thing. The valves were open, but none of the motors had gone far enough to hit the relay. All three motors were hot. The basement (with the new motor) was one of the zones! This morning, only the basement valve is acting up. The other two zones appear to be working correctly.
Any idea what's going on here?