Webster Cyclonetic SG Series, Installation, Startup, Operation And Maintenance Manual

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