MAINTENANCE & TROUBLESHOOTING 4
Questions? Call (315) 298-5121, or visit us online at www.fulton.com
4-25
VSRT_IOM_2018-1213
Troubleshooting Gas Fired Boilers
Problem Cause Remedy
Poor Combustion
Damaged Refractory
Check refractories to see if they are plugged with soot or
broken in pieces. Clean or replace as necessary.
Not Enough Air/Build-Up on
Fan Wheel (Rich; Burner Hums)
Check CO2/O2 levels. If rich, disassemble lter housing and
gas train. Look inside inlet to the fan. If there is build-up on
the fan blades, clean fan. Recheck the CO2/O2 and adjust
gas valve as necessary for all combustion points.
Fuel Valve Adjusted Too High
(Rich; Burner Hums)
Check CO2/O2 levels. Check gas pressure at outlet of valve.
If the pressure is too high, make an adjustment at the valve.
Be sure to check all combustion points.
Fan Speed Too High (Lean;
Unstable Flame)
Check fan discharge pressure. If too high, adjust fan speed.
Check CO2/O2 levels and adjust gas valve as necessary. Be
sure to check all combustion points.
Gas Valve Adjusted Too Low
(Lean; Unstable Flame)
Check CO2 and O2 levels. Check pressure at outlet of the
valve. If too negative, adjust gas valve as necessary.
Draft
Check draft with a gauge. Draft should be within the range
of -0.25” w.c. to + 1.50” w.c. May need to install a barometric
damper.
Dirty Flue
Check ue for carbon buildup or blockage. Clean ue
passages with brush.
Negative Room Pressure Make sure no exhaust fans are running in the boiler room.
Burner back res
Damaged Refractory
Check refractories to see if they are plugged with soot or
broken in pieces. Clean or replace as necessary.
Ignition Electrodes
Check electrodes for carbon buildup and clean if necessary.
Check for proper adjustment. Readjust if necessary. Check
for cracks in porcelain; if found replace.
UV Scanner
Check for debris on ame scanner and clean as needed.
Check for proper location of detector.
Draft
Check draft with a gauge. Draft should be within the range
of -0.25” w.c. to + 1.50” w.c. May need to install a barometric
damper.
Negative Room Pressure Make sure no exhaust fans are running in the boiler room.
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