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No.
System
1
No Ignition
(lack of spark)
2
No Ignition
(spark, no flame)
3
Flame not detected
(Flame present)
4
Burner stays at low fire
5
Burner shuts down
during operation
6
Burner does not start
7
High CO at low fire
SG Manual
G. TROUBLESHOOTING
Cause
Electrode is grounded. Porcelain is cracked.
Improperly positioned electrode
Loose ignition wire connection
Defective ignition transformer
Lack of fuel, no gas pressure, closed fuel valve
No voltage to gas valve
Defective gas valve
Improperly positioned electrodes
Too much combustion air flow
Scanner tube dirty or wet
Scanner or amplifier faulty
Incorrect gas pressure
Combustion air flow rate too high
Manual pot in low fire position (low fire hold)
Manual-auto switch or low fire hold switch in wrong position
Modulating Control or Lo-Hi-Lo Control
Loose linkage
Binding linkage or valve
Loose electrical connection
Loss of fuel supply
Limit switch breaks (opens)
Main disconnect switch is open
Loose electrical connection
Operating controls are tripped
High or low fuel pressure
Improper excess air level
Input too low for burner components
Page 16
Correction
Replace
Recheck dimensions
Reconnect or tighten
Check transformer, replace
Check fuel supply and valves
Check electrical connections
Replace
Recheck dimensions
Check air damper position
Clean scanner tube / scanner
Replace
Readjust pressure
Readjust damper
Readjust to high fire position
Change position of switch
Check wiring or replace
Readjust and tighten
Readjust or replace
Check and tighten connections
Replenish fuel supply
Readjust limit switch
Close switch
Check electrical connections
Check and reset operating limits
Check fuel supply - reset switches
Readjust excess air
Check input, compare to rating label
Troubleshooting
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