A.O. Smith COF-199 manual Trouble Cause Remedy, OIL Burner Troubleshooting

TROUBLESHOOTING

TABLE 10 - OIL BURNER TROUBLESHOOTING

TROUBLE	CAUSE	REMEDY
	Oil level below intake line in supply tank.	Fill tank with oil.
	Clogged strainer or filter.	Remove and clean strainer. Replace filter element.
	Clogged nozzle.	Replace nozzle.
	Air leak in intake line.	Tighten all fittings in intake line. Tighten unused intake
		port plug. Check filter cover and gasket.
	Restricted intake line. (High vacuum reading).	Replace any kinked tubing and check any valves in
No Oil Flow		intake line.
	A two line pipe system that becomes air bound.	Check for and insert by-pass plug. Make sure return
at Nozzle		line is below oil level in tank.
	A single line pipe system that becomes air bound.	Loosen gauge port plug or air bleed valve and bleed oil
		for 15 seconds after foam is gone in bleed hose, Check
		intake line fittings for tightness. Check all fuel pump plugs
		for tightness.
	Slopping or broken coupling.	Replace coupling.
	Rotation of motor and fuel unit pump is not the
	same as indicated by arrow on the pad at top of unit.	Install fuel pump with correct rotation.
	Frozen fuel pump shaft.	Replace fuel pump. Check for water and dirt in tank.
	Loosen plugs and fittings.	Tighten with good quality thread sealer.
Oil Leak	Leak at pressure adjusting screw or nozzle plug.	Replace fuel pump.
	Blown seal (single-pipe system)	Check to see if by-pass plug has been left in fuel pump.
		Replace fuel pump.
	Seal leaking.	Replace fuel pump.
	Cover.	Tighten cover screws.
	Bad coupling alignment.	Loosen fuel pump mounting screws slightly and shift
Noisy		fuel pump in different positions until noise is eliminated.
Operation		Retighten mounting screws.
	Air in inlet line.	Check all connections. Use only good flare fittings.
	Tank turn on two line pipe system and inside tank.	Install return line hum eliminator.
	Partially clogged strainer or filter.	Remove and clean strainer.
	Air leak in intake line.	Tighten all fittings.
	Air leaking around cover.	Be sure strainer cover screws are tightened securely.
		Check for damaged cover gasket.
Low Oil	Defective gauge	Check gauge against master gauge or other gauge.
Pressure	Nozzle capacity is greater than fuel pump capacity.	Replace fuel unit with unit of correct capacity.
	To determine the cause of improper cut-off, insert
	a pressure gauge in the nozzle port of the fuel pump.
	After a minute of operation, shut burner down. If the
	pressure drops from normal operating pressure and
	stabilizes, the fuel pump is operating properly and air
	is the cause of improper cut-off. If, however, the
	pressure drops to 0 psi, fuel unit should be replaced.
Improper	NOTE: Never use the amount of pressure drop as an
Nozzle	indication of the quality or speed of cut-off.
Cut-Off	Filter leaks.	Check face of cover and gasket for damage.
	Strainer cover loose.	Tighten 4 screws on cover.
	Air pocket between cut-off valve and nozzle.	Run burner, stopping and starting unit, until smoke
		and after-fire disappears.
	Air leak in intake line.	Tighten intake fittings. Tighten unused intake port and
		return plug.
	Partially clogged nozzle strainer.	Clean strainer or change nozzle.
	Leak at nozzle adaptor.	Change nozzle and adaptor.

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