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Posted by HeatPro on February 23, 2007 at 13:14:25:
In Reply to: boiler behaving badly posted by rbarnes on February 23, 2007 at 11:13:12:
It is the job of the serviceperson to find out. He does that with the proper instruments and lists the results of the testing which gives clues to the reason for problems.
http://www.heatpro.us/service/oilserv.htm
You seem to have a bad draft from a clog - or a pressure maladjustment; both require test instruments.