Troubleshooting - Webster JB Series Installation, Startup, Operation And Maintenance Manual

J BOILER BURNER TROUBLESHOOTING, Model JB
.
No. System
1 No Ignition
(lack of spark)
2 No Ignition
(spark, no flame)
3 Pilot not detected
(flame present)
4 No main gas flame
(pilot OK)
5 No main oil flame
(pilot OK)
6 Burner stays at low fire
7 Burner shuts down
during operation
8 Burner does not start
9 High CO at low fire
(firing gas)
JB Manual
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 pilot solenoid
Defective pilot solenoid valve
Incorrect location of pilot
Improper raw gas tube position
Improperly positioned electrodes
Too much combustion air flow
Scanner tube not positioned correctly
Scanner tube dirty or wet (oil film)
Scanner or amplifier faulty
Pilot improperly positioned
Incorrect gas pressure to pilot
Combustion air flow rate too high
Weak scanner signal
Damper or fuel control valve setting incorrect
Fuel valve(s) not opening
Weak scanner signal
Damper or fuel control valve setting incorrect
Fuel valve(s) not opening
Oil nozzle or line obstructed
No atomizing air pressure
Compressor pressure too low or high
Burner not level, oil is draining into vessel
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 42
Correction
Replace
Recheck dimensions
Reconnect or tighten
Check transformer, replace
Check fuel supply and valves
Check electrical connections
Replace
Check location of pilot
Check location of raw gas tube
Recheck dimensions
Check air damper position
Check location of scanner tube
Clean scanner tube / scanner
Replace
Check pilot position
Readjust pressure
Readjust damper
Clean scanner lens and tube
Readjust
Check wiring to valves
Clean scanner lens and tube
Readjust
Check wiring to valves
Check nozzle and lines, clean
Check compressor wiring
Readjust
Check level, adjust as required.
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