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If the circulator pump is not running It may be that another circulator pump is forcing boiler water through that zone when it runs,if so , you may have to install a zone valve to make sure the zone is completely closed off when not in use. Hope this helps.
Hi there, this mechanical t-stat you are using now, does it just open and close this zone valve on a call for heat to fire the burner also? What voltage is this thermostat, 24, 120, or even 220 volts? I need to no this so I can locate the stat you need to replace the old mechanical stat. Let me know exactly what all this stat controls, any fan, or just the burner and zone valve. I need to know the wiring configuration of the existing stat. This will make for a faster locating of the new stat. I can get you a stat that you can control just about any combination's of what ever and that's why I need to know voltages and amount of wires available to me to work with. This I thank you for. Contact me and I will get to you as soon as I am available today. Sincerely, Shastalaker7
The loud buzzing you hear is the sound of the magnatron tube.That is what emits the microwave radiation and buzzing should be normal. The mag tube may be nearing its end at witch time you will hear no buzzing and hence no heating of foods. Replacement can be costly depending on the model so most people just opt for a new one. Hope this helps