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I have a williamson boiler with 3 zones, 2 heating zones and one zone for a hot water heater. I have a problem, maybe you know a answer. I've tried calling couple of plumbers to the house and they couldnt figure it. First guy said, the vent is no good. Changed that same problem, second guy said the one way flow valve from the boiler to the baseboards was no good, changed that and still same problem. What is happening is when the thermostat calls for heat the boiler works initially and then shuts off. The pumps keep circulating water but the boiler doesnt go back on. Only way it goes back on is, i have to power off the whole system and then turn it back on. Any advice?