Welcome! Here are the website rules, as well as some tips for using this forum.
We just had a Weil-McLain boiler installed with a Taco ZVC406-4 zone valve control. We paid $ plus for the boiler and installation. The problem is slow heat. Doing a little research online, I came to the conclusion the circulator pump isn't working. So we called the plumber who installed it. I told him what I thought the problem was and we went back and forth on it. He insists "The circulator pump has to be working or we wouldn't have any hot water at our taps." I told him I thought that was wrong, the hot water at the taps would work because of town water pressure. After coming here twice, he insists its working and said he doesn't know how to explain it to me so I'd understand..!
This morning I took my multimeter downstairs and disconnected the pump. I turned on our heat and hot water and checked the wires. No voltage. I took the cover off the panel and tested where the wires connect. No power. There is a little transparent relay just above the panel connection point. If I turn the power off to the whole system and turn it back on, the relay clicks and you can see it making contact but no power to the leads.
So what do you think? Is that relay bad even though it engages? Money is tight so I'd like to fix it myself. Any advice would be appreciated. Thanks