I have a Utica MGB1252 residential forced water boiler that started whistling after a tech replaced the gas valve (replaced to get rid of that valves failed Mercury Flame sensor). After replacement the main burner whistles exactly like in this video (jump to 1:00) - https://www.youtube.com/watch?v=gmDIcN75w7M . He couldn't figure out why but and neither can I after researching this for some time. Any ideas?
Thanks
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