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29733 R2 06/01/2003
37
T
ABLE C-4: SYSTEM & GENERAL TROUBLESHOOTING, continued from previous page
Problem Possible Cause Remedy
No fuel oil.
Check fuel oil supply. Check that all hand operated fuel
oil valves are in the open position. Fill oil storage tank if
necessary.
Clogged nozzle.
Replace nozzle with high quality replacement. Use rating
plate or Tables in Appendix A as a guide.
Clogged oil filter. Replace oil tank filter or in-line filter if used.
Low oil pump pressure.
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.
Air getting into fuel oil
lines, or fuel oil line dirty,
clogged, or in some
manner defective.
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.
Furnace will not start
without first pushing
oil primary control
reset button.
(Happens on frequent
basis)
Defective burner motor.
Check burner motor. If burner motor is cutting out on
over-load, determine why. Replace if necessary.
Furnace starts, but
cuts out requiring
manually resetting
the oil protector reset
button.
Photo Cell (Cad Cell)
defective.
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 100K W in
absence of light; a maximum of 1500 W in the presence
of light. Ensure that room light is not leaking into the cad
cell compartment. (see diagnostic light section).
No fuel oil.
Check fuel oil supply. Check that all hand operated fuel
oil valves are in the open position. Fill oil storage tank if
necessary.
Clogged nozzle.
Replace nozzle with high quality replacement. Use rating
plate or Tables in Appendix A as a guide.
Clogged oil filter. Replace oil tank filter or in-line filter if used.
Low oil pump pressure.
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.
Air getting into fuel oil
lines, or fuel oil line dirty,
clogged, or in some
manner defective.
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.
Defective burner motor.
Check burner motor. If burner motor is cutting out on
over-load, determine why. Replace if necessary.
Water or contaminants in
oil.
Drain fuel oil storage tank, replace fuel oil. (Consult with
fuel oil supplier).
Furnace starts, but
cuts out requiring
manually resetting
the oil protector reset
button.
Frozen oil line.
Gently warm oil line. Insulate oil line. (Outdoor piping
size may require increased diameter).
Continued on next page