750-91 (revised 2009)
Model CB-LE Packaged Boiler Manual
7-3
7.1 — Overview
NO IGNITION 1. Lack of spark.
A. Electrode grounded or porcelain cracked.
B. Improper electrode setting.
C. Loose terminal on ignition cable - or cable shorted.
D. Inoperative ignition transformer.
E. Insufficient or no voltage at pilot ignition circuit terminal.
2. Spark but no flame.
A. lack of fuel - no gas pressure, closed valve, empty tank, broken line, etc.
B. Inoperative pilot solenoid.
C. Insufficient or no voltage at pilot ignition circuit terminal.
D. Too much air.
3. Low-fire switch open in low-fire proving circuit.
A. Damper motor not closed, slipped cam, defective switch.
B. Damper jammed or linkage binding.
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 FLAMW
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.
4. Defective modulating control.
5. Binding or loose linkage, cams, setscrews, etc.
Problem Possible Cause(s)
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