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Posted by HeatPro on November 20, 2008 at 00:02:09:
In Reply to: Weil Mclain Overfilling posted by Katie on November 19, 2008 at 21:29:36:
Do a service. Remove the glass and drain the system to see if you can blow through the gauge glass valves. Or remove the valves and make sure. If time plugged the ports to the glass, then there is probably a LOT of hard sludge inside the boiler.