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I have a steam boiler in private house two family.
First time in many years can not find problem.
Called tech no solve also. Thanks ahead.
Slant fin. Lol. Ran low on oil. But did not need to bleed to start (unusual ). Ran for hr. Shut off. Changed filters nozzle. Then Tech came says fuel pump because it started then would fail after ten minutes. Hint : also changed wheel and coupling that looked brown and was making a grinding noise. Changed the fuel pump but still same problem. Tech says electric rods burnt out. Sets them next day. Week later boiler shuts off , reset switch and it works for a day makes heat hot water then shuts off.
When the clear cut motor finishes the clean there is a small puff of smoke on the initial ignition. All the time.