Nordyne O4MD Installation, Operation And Maintenance Manual page 26

Problem Possible Cause Remedy
Ensure that the wires from the L4064W fan/limit control
Faulty L4064W heater
are connected to T2 and F2 on the R8184N primary
wiring, control.
Check fuel oil supply. Check that all hand operated fuel
No fuel oil. 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.
Connect pressure gauge to oil pump. Adjust pump
Furnace starts, but Low oil pump pressure, pressure, or replace oil pump if necessary. Ensure that
erratic pressure readings are not caused by defective
cuts out requiring fuel oil line.
manually resetting
the oil protector reset Air getting into fuel oil Check fuel oil lines. Replace any compression fittings
button, lines, or fuel oil line dirty, found with high quality flared fittings. Check for any
...continued clogged, or in some signs of oil leaks. Any oil leak is a potential source of air
manner defective, or contaminants.
Check burner motor. If burner motor is cutting out on
Defective burner motor.
over-load, determine why. Replace if necessary.
Water or contaminants in Drain fuel oil storage tank, replace fuel oil. (Consult with
oil. fuel oil supplier).
Frozen oil line. Gently warm oil line. Insulate oil line. (Outdoor piping
size may require increased diameter).
Ensure that the primary control (Protector Relay) is an
R8184N. Substitutes such as the R8184G do not have
Wrong primary control.
sufficient capacity to operate both the safety circuit and
fan circuit.
Electrodes out of Check electrode settings. Check electrodes for dirt
adjustment or defective, build-up or cracks in porcelain.
Poor transformer high Check contacts between transformer and electrodes. If
voltage connections or OK, replace transformer.
defective transformer.
Oil burner sputtering Replace fuel oil storage tank filter and / or fuel oil in-line
at nozzle Fuel oil filter clogged, filter.
Check burner motor / fuel oil pump coupling. Check oil
Defective oil pump.
pump pressure. Replace fuel oil pump if necessary.
Fuel oil line partially Bleed air from oil line. If problem persists, replace oil
clogged or contains air. line.
System temperature rise
too high.
Excessive fuel oil
consumption.
Blower fan control out of
adjustment, (fan stops
too soon).
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 25 ° - 30°F higher
than the "fan off" setting.
26 153B0801