PROBLEM SOLUTION
No Ignition 1. Lack of spark.
a. Electrode grounded or porcelain cracked.
b. Improper electrode setting.
c. Loose terminal on ignition cable, 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 fuel valve, empty tank, broken line.
b. Too much air flow.
c. No voltage to pilot solenoid.
d. Defective pilot solenoid.
e. Improperly positioned electrode (direct spark models).
3. Low -fire switch open in low-fire proving circuit.
a. Damper motor not closed, sli
pped cam, defective switch.
b. Damper jammed or linkage binding.
4. Running interlock circuit not completed.
a. Combustion proving switches defective or not prope
rly set.
b. Motor starter interlock contact not closed.
5. Flame detector defective, sight tube obstructed, or lens dirty.
PROBLEM SOLUTION
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. Broken, loose or missing oil pump coupling.
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.
Profire V Burner Chapter 2
750-177 2-51
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