Chapter 7 - Troubleshooting
Part No. 750-184 7-3
4. Running interlock circuit not completed.
A. Combustion or atomizing air proving switches defective or not properly set.
B. Motor starter interlock contact not closed.
5. Flame detector defective, sight tube obstructed, or lens dirty.
PILOT FLAME, BUT NO
MAIN FLAME
1. Insufficient pilot flame.
2. Gas Fired Unit.
A. Manual gas cock closed.
B. Main gas valve inoperative.
C. Gas pressure regulator inoperative.
3. Oil fired unit.
A. Oil supply cut off by obstruction, closed valve, or loss of suction.
B. Supply pump inoperative.
C. No fuel.
D.Main oil valve inoperative.
E. Check oil nozzle, gun and lines.
4. Flame detector defective, sight tube obstructed or lens dirty.
5. Insufficient or no voltage at main fuel valve circuit terminal.
BURNER STAYS IN LOW
FIRE
1. Pressure or temperature above modulating control setting.
2. Manual-automatic switch in wrong position.
3. Inoperative modulating motor (see Section F).
4. Defective modulating control.
5. Binding or loose linkage, cams, setscrews, etc.
SHUTDOWN OCCURS
DURING FIRING
1. Loss or stoppage of fuel supply.
2. Defective fuel valve; loose electrical connection.
3. Flame detector weak or defective.
4. Lens dirty or sight tube obstructed.
5. If the programmer lockout switch has not tripped, check the limit circuit for an
opened safety control.
Problem Solution
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