Thermo Pride Oil Furnace (general service and maintenance) - Manual (Page 20)

All installations and services must be performed by qualified service personnel.
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? ? ? ?CAUTION: Do not attempt to start burner when:
1.Excess oil has accumulated
2.When the furnace or burner is full of vapor
3.When the combustion chamber is very hot.
If one or more of these conditions exist, contact a qualified service personal.
8. Follow "initial burner operation" procedures from section G.