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 pilot solenoid Check electrical connections
Defective pilot solenoid valve Replace
Incorrect location of pilot Check location of pilot
Improper raw gas tube position Check location of raw gas tube
Improperly positioned electrodes Recheck dimensions
Too much combustion air flow Check air damper position
3 Pilot not detected Scanner tube not positioned correctly Check location of scanner tube
(flame present) Scanner tube dirty or wet (oil film) Clean scanner tube / scanner
Scanner or amplifier faulty Replace
Pilot improperly positioned Check pilot position
Incorrect gas pressure to pilot Readjust pressure
Combustion air flow rate too high Readjust damper
4 No main gas flame Weak scanner signal Clean scanner lens and tube
(pilot OK) Damper or fuel control valve setting incorrect Readjust
Fuel valve(s) not opening Check wiring to valves
5 No main oil flame Weak scanner signal Clean scanner lens and tube
(pilot OK) Damper or fuel control valve setting incorrect Readjust
Fuel valve(s) not opening Check wiring to valves
Oil nozzle or line obstructed Check nozzle and lines, clean
No atomizing air pressure Check compressor wiring
Compressor pressure too low or high Readjust
Burner not level, oil is draining into vessel Check level, adjust as required.
6 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
7 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
8 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
9 High CO at low fire Improper excess air level Readjust excess air
(firing gas) Input too low for burner components Check input, compare to rating label
Page 42 TroubleshootingJB Manual
BOILER BURNER TROUBLESHOOTING, Model JB
J.
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