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Table C-4: System and General Troubleshooting
Problem
Furnace will not start.
Furnace will not start
without first pushing oil
primary control reset
button.
(Happens on frequent
basis)
Furnace starts, but cuts
out requiring manually
resetting the oil protector
reset button.
Furnace starts, but cuts
out requiring manually
resetting the oil protector
reset button.
Oil burner sputtering at
nozzle
continued
Possible Cause
Photo Cell wiring shorted or
room light leaking into photo
cell compartment
Open safety switch.
No fuel oil.
Clogged nozzle.
Clogged oil filter.
Low oil pump pressure.
Air getting into fuel oil lines, or
fuel oil line dirty, clogged, or in
some manner defective.
Defective burner motor.
Photo Cell (Cad Cell)
defective.
No fuel oil.
Clogged nozzle.
Clogged oil filter.
Low oil pump pressure.
Air getting into fuel oil lines, or
fuel oil line dirty, clogged, or in
some manner defective.
Defective burner motor.
Water or contaminants in oil.
Frozen oil line.
Electrodes out of adjustment or
defective.
Poor transformer high voltage
connections or defective
transformer.
Fuel oil filter clogged.
Defective oil pump.
Fuel oil line partially clogged or
contains air.
Check photo cell (cad cell) wiring for short circuits. Also, check
for room light leaking into cad cell compartment. Repair light
leak if necessary. See Table C-3.
Check for open limit or auxiliary limit. Also, check internal wiring
connections; loose connectors, etc.
Check fuel oil supply. Check that all hand operated fuel oil
valves are in the open position. Fill oil storage tank if necessary.
Replace nozzle with high quality replacement. Use rating plate
or Tables in Appendix A as a guide.
Replace oil tank filter or in-line filter if used.
Connect pressure gauge to oil pump. Adjust pump pressure, or
replace oil pump if necessary. Ensure that erratic pressure
readings are not caused by defective fuel oil line.
Check fuel oil lines. Replace any compression fittings found with
high quality flared fittings. Check for any signs of oil leaks. Any
oil leak is a potential source of air or contaminants.
Check burner motor. If burner motor is cutting out on over-load,
determine why. Replace if necessary.
If cad cell is dirty, clean it. (Determine why cad cell is getting
dirty). If cad cell is poorly aimed, realign it. NOTE: The photocell
should have a resistance of 100 KΩ in absence of light; a
maximum of 1500 Ω in the presence of light. Ensure that room
light is not leaking into the cad cell compartment. (See
diagnostic light section).
Check fuel oil supply. Check that all hand operated fuel oil
valves are in the open position. Fill oil storage tank if necessary.
Replace nozzle with high quality replacement. Use rating plate
or Tables in Appendix A as a guide.
Replace oil tank filter or in-line filter if used.
Connect pressure gauge to oil pump. Adjust pump pressure, or
replace oil pump if necessary. Ensure that erratic pressure
readings are not caused by defective fuel oil line.
Check fuel oil lines. Replace any compression fittings found with
high quality flared fittings. Check for any signs of oil leaks. Any
oil leak is a potential source of air or contaminants.
Check burner motor. If burner motor is cutting out on over-load,
determine why. Replace if necessary.
Drain fuel oil storage tank; replace fuel oil. (Consult with fuel oil
supplier).
Gently warm oil line. Insulate oil line. (Outdoor piping size may
require increased diameter).
Check electrode settings. Check electrodes for dirt build-up or
cracks in porcelain.
Check contacts between the igniter and electrodes. If OK,
replace the igniter
Replace fuel oil storage tank filter and / or fuel oil in-line filter.
Check burner motor and / or fuel oil pump coupling. Check oil
pump pressure. Replace fuel oil pump if necessary.
Bleed air from oil line. If problem persists, replace oil line.
26
Remedy
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