What to know when cleaning the burner and boiler with some simple tools. Whether you DIY or have a company do it, here is what the steps are. REMEMBER you will still need a qualified tech to set the draft, CO2 %, pump pressure which require expensive tools.
I had a company out and they forgot to clean out my chimney. 5 service calls and $270 later they figured out why my boiler was tripping. I just trusted the first guy knew what he was doing and he skipped cleaning the chimney bottom out.