Garland ST286-E - Flame Supervision Device

Part # 138683 (01/08) Page 25
Open Burner – Models Equipped with Flame Supervision Device
Problem Possible Cause Solution
Burner ame too large Incorrect gas pressure Check gas pressure
Burner ame soft – yellow tip Insucient primary air Adjust air shutter
Flame lifts o burner ports Excessive Primary air
Flame burns back to orice
Burner “pops” after shutting o
Delayed ignition Pilot ame too small Adjust pilot ame
Burner ports blocked Clean burner
Incorrect gas/air mixture Adjust air shutter
Incorrect gas pressure Check gas pressure
Pilot burner will not ignite Pilot orice blocked Clean pilot orice
Pilot adjusting screw closed Open and adjust pilot
Pilot repeatedly goes out Pilot ame too small Adjust pilot ame
Loose thermocouple connection Tighten connection
Faulty Thermocouple Replace thermocouple
Faulty ame safety device Replace ame safety device
Low millivolt output on open circuit test Pilot ame too small Adjust pilot ame
Defective thermocouple Replace thermocouple
Millivolt output high in open circuit test,
but low in closed circuit test
Faulty ame safety device Replace ame safety valve
Millivolt output high in closed circuit test,
but safety valve will not stay open
Faulty ame safety device Replace ame safety valve
No spark to pilots,
(*-E models only)
*No power to range Check power supply
*Defective momentary switch Replace switch
*Defective spark module Replace spark module
*Disconnected or loose
High tension wires
Reconnect high tension wires
TROUBLESHOOTING Continued