Not calling for heat for hot water zone only

802

I have a Weil-Mclain HE II with a newly installed control board (model 1013-200). I have a separate water storage tank fed by the boiler. I have no hot water, and the boiler is not calling for heat. It WILL call for heat if a room thermostat is turned up for the baseboard heaters. I replaced the temperature sensor in the water tank. I can hear the zone valve open when I jump the temp sensor wires, and the circulator pump comes on. I've cleaned up wire connections that look bad and replaced a section of the temperature sensor wire. I replaced the control board as i stated earlier because it seemed the only piece left actually communicating with the boiler. The problem seemed solved for a few couple days, then no heat again. Any thoughts?

mattmia2

did yo check the end switch on the zone valve? does that call the boiler?

EdTheHeaterMan

Sounds like a bad zone valve end switch. Did the control board work on a call for heat from a Central heat zone? Seems like an expensive place to start. The zone valve actuator might be a little less expensive.

What is the thermostat for the water heater connected to? Directly to a zone valve, or is it connected to a zone control panel like the Erie Zone Control. Taco ZVC or some other device that is between the thermostat and zone valve?