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Posted by HeatPro on September 24, 2009 at 19:15:06:
In Reply to: WEIL-MCLAIN - smoke coming back into house posted by E Braz on September 24, 2009 at 17:21:41:
The reason you won't find a complicated and dangerous procedure requiring expensive combustion test instruments and considerable supervised training online is just that.
Call a competent and experienced repair company.
http://www.heatpro.us/service/oilserv.htm