Nordyne O4LD-140A-16F Installation, Operation And Maintenance Manual page 15

Problem
Furnace starts, but
cuts out requiring
manually resetting
the oil protector reset
button.
...continued
Oil burner sputtering
at nozzle
Excessive fuel oil
consumption.
Possible Cause
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.
System temperature rise
too high.
Blower fan control out of
adjustment, (fan stops
too soon).
Fuel oil leak.
Stack temperature too
high.
Check fuel oil supply. Check that all hand operated all
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 transformer and electrodes. If
OK, replace transformer.
Replace fuel oil storage tank filter and / or fuel oil in-line
filter.
Check burner motor / 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.
System temperature rise should not exceed 85°F.
Check for clogged air filters. Check blower fan for
excess dirt build-up or debris. Speed up blower fan if
necessary.
Check fan control settings. The fan control is adjusted
with a duct thermometer in the supply air plenum take-
off or first few inches of the supply air trunk duct. The "
fan off" setting should be 90° - 100°F. Once set, the
"fan on" setting is normally adjusted 10° - 30°F higher
than the "fan off" setting.
Check fuel oil line for leaks. Repair or replace if
necessary.
Check stack temperature. Stack temperatures will
normally range from 350° to 575°F. Check draft
regulator. Draft should be set to 0.02 in. w.c.
15
Remedy
152B0801