Chapter 7 Troubleshooting
7-2 750-177
SYMPTOM CAUSE ACTION
NO IGNITION
(LACK OF SPARK).
Electrode is grounded, porcelain is
cracked.
Replace.
Improperly Positioned Electrode Recheck Dimensions
Loose connection between electrode and
ignition transformer.
Reconnect or tighten.
Defective ignition transformer. Check transformer winding continuity.
NO IGNITION
(SPARK WITH NO FLAME).
Lack of fuel -- no gas pressure, closed fuel
valves, etc.
Check fuel supply and valves.
No voltage to pilot solenoid. Check electrical connections.
Defective pilot solenoid valve. Replace.
Improperly positioned electrodes. Recheck dimensions.
Too much air flow. Check air shutter position.
PILOT IS PRESENT, BUT
NO MAIN FLAME
(GAS-FIRED UNITS).
Weak signal to the FS scanner. Check scanner for dirt buildup on lens.
Linkage setting is incorrect. Readjust.
High or low gas pressure. Reset switch.
Fuel valve(s) not operating. Check wiring circuit to fuel valve(s).
PILOT IS PRESENT, BUT
NO MAIN FLAME
(OIL-FIRED UNITS).
Weak signal to the FS scanner. Check scanner for dirt buildup on lens.
Linkage setting is incorrect. Readjust.
Motor - Oil Pump coupling is missing,
loose or damaged.
Investigate and repair/replace.
Oil nozzle, gun assembly, fuel lines are
obstructed.
Check lines and gun for foreign objects.
Fuel valve(s) not operating. Check wiring circuit to fuel valve(s).
BURNER STAYS IN LOW
FIRE.
Manual -- Automatic switch is in incorrect
position.
Investigate and repair.
Defective modulating motor. Replace.
Loose linkages Readjust/tighten setscrews.
BURNER SHUTS DOWN
DURING OPERATION.
Defective fuel valve or loose electrical
connection.
Investigate and repair.
Loss or stoppage of fuel supply. Replenish fuel supply.
Flame detector is weak or defective. Repair or replace.
Lens on scanner is dirty or sight tube is
obstructed.
Investigate and repair.
Operating controls are tripped. Investigate and repair
Flame failure due to abrupt changes in fuel
delivery.
Investigate and repair
Foreign objects are present within burner. Investigate and repair.
BURNER DOES NOT
START.
Main disconnect switch is open. Check switch.
Loose electrical connection. Investigate and repair.
Operating controls are tripped. Reset and proceed.
High or low gas pressure. Investigate and repair
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