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Troubleshooting: Burner fails to start
Source
Correction
Causes
Procedure
Primary Control
Place trouble light between
the black and white leads.
No light indicates that no
power is going to the
control.
Primary or auxiliary control
switch is open
Check adjustment. Set the maximum setting.
Jumper terminals; if burner starts, switch is faulty,
replace control.
Open circuit between
disconnect switch and limit
control
Trace wiring and repair or replace it.
Low line voltage or power
failure
Call the power company.
Place trouble light between
the orange and white leads.
No light indicates faulty
control.
Defective internal control
circuit
Replace the control.
Burner
Place the trouble light
between the black and
white leads to the burner
motor. No light indicates
that no power is getting to
the motor.
Blown fuse
Replace the fuse.
Place trouble light between
the black and white leads to
the blower motor. Light
indicates power to the
motor and burner fault.
Binding burner blower
wheel
Turn off power and rotate the blower wheel by hand.
If seized, free the wheel or replace the fuel pump.
Sized fuel pump
Defective burner motor
Replace the motor.
Troubleshooting: Burner starts, but no flame is established
Source
Procedure
Causes
Correction
Oil Supply
Check tank gauge or use dip stick.
No oil in tank
Fill tank.
Coat dip stick with litmus paste and
insert into bottom of tank.
Water in oil tank
If water depth exceeds 1 inch, pump
or drain water.
Listen for pump whine.
Tank shut−off valve closed
Open valve.
Oil Filters & Oil
Line
Listen for pump whine.
Oil line filter is plugged
Kinks or restriction in oil line
Plugged fuel pump strainer
Replace filter cartridges.
Repair or replace oil line.
Clean strainer or replace pump.
Open bleed valve or gauge port.
Start the burner. No oil or milky oil
indicates loss or prime.
Air leak in oil supply line
Locate and correct leak.
Tighten all connections.
Oil Pump
Install pressure gauge on pump and
read pressure. Should not be less
than 140 psi.
Pump is partially or completely
frozen. No pressure and the motor
locks out on overload.
Replace pump.
Coupling disengaged or broken − no
pressure
Re−engage or replace coupling.
Fuel pressure too low
Adjust to 100 psi.
Nozzle
Disconnect ignition leads. Observe
the oil spray (gun assembly must be
removed from unit). Inspect the
nozzle for plugged orifice or carbon
build−up around orifice.
Nozzle orifice plugged
Nozzle strainer plugged
Poor or off center spray
Replace nozzle with the same size,
spray angle, and spray type.
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