Royal Appliance Air Furnace

29733 R2 06/01/2003

TABLE 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).