38
Flame failure
(spark OK)
Flame failure
occurs at the end
of ignition spark.
Flame failure
(pilot burner
ignites)
Flame failure
occurs during
main flame trial
50%
Pilot burner is
OK.
50%
Flame failure occurs
after main flame was
ignited for a while
30%
Main burner does not
ignite
70%
Flame failure
(no spark)
Gas pressure
alarm
Measure gas
supply pressure
80%
Check gas pressure
switch
20%
Air flow
alarm
Confirm air flow
switch
80%
Measure pressure
inside the wind
box
20%
4 - Combustion alarm (16DJ)
APPENDIX 1 - TROUBLESHOOTING FLOWCHART - CONT.
Protection relay is defective.
Pilot burner is not properly adjusted.
Pilot solenoid valve is defective.
Pilot gas regulator is defective.
Flame detector (UV tubes) is defective.
Protection relay is defective.
Pilot burner is not properly adjusted.
Main gas regulator is defective.
Flame detector cannot detect a flame.
Main gas shut-off valve is defective.
Gas supply pressure fluctuates.
Flue is clogged.
Protection relay is defective.
Gas/air linkage is not properly adjusted.
Main gas regulator is defective.
Gas/oil flow meter is locked.
Flue is clogged.
Voltage drops.
Protection relay is defective.
Check if test cock opens or not.
Check if gas/oil/air linkage is loose.
Main gas shut-off valves are defective.
Ignition transformer is defective.
Microprocessor is defective.
Position of spark rod is not properly adjusted.
Insulation of spark rod is defective.
Ignition spark wire is removed or broken.
Protection relay is defective.
Flame detector is defective.
Flame remains after stop of combustion.
Check gas regulator in main gas pipe line.
Check gas strainer.
Check other equipment installed in main gas pipe line.
Check gas regulator installed in gas train.
Confirm movement of the switch.
Check the setting.
Check the setting.
Check the contact of the air flow switch.
Check if the air flow switch is installed correctly.
Check the suction side of the wind box for obstruction by foreign
material.
Check the tube between the box and the air flow switch for
obstruction by foreign material.