No. System Cause Correction
High CO at low fire (con’t) High stack draft (especially at low fire) Stabilize draft
(firing gas) Poor air flow distribution (off center flame) Adjust air straightener blade
Diffuser not in optimum position Adjust diffuser position in or out
Fluxuating gas pressure (regulator not holding pressure) Check regulator pressure, sensing line
and supply pressure: sized properly
10 Gas combustion noise Input too low for burner components Check input, compare to rating label
(rumbling) Improper excess air Readjust excess air
Fluxuating gas pressure (regulator not holding pressure) Check regulator pressure and supply
High stack draft (especially at low fire) Stabilize draft
Diffuser not in optimum position Adjust diffuser position in or out
Poor air flow distribution (off center flame) Adjust air straightener blade
11 Oil combustion smoking Oil nozzle dirty or plugged Clean oil nozzle
Improper excess air Readjust excess air
Input too low for burner components Check input, compare to rating label
High stack draft (especially at low fire) Stabilize draft
Incorrect nozzle position Adjust the nozzle to diffuser position
Fluxuating oil pressures (regulator not holding) Check regulator pressure and oil supply
Poor air flow distribution (off center flame) Adjust air straightener blade
Too much FGR (if equipped) Reduce FGR rate
12 Fuel-Air-Ratios are Linkage flexing Realign linkage, straighten rods
not consistent Linkage slip Check linkage and tighten all joints
Fuel cam screws have moved Replace fuel cam
Fuel line plugged Check and clean lines, strainers & filters
Fuel supply pressure changing Check and/or replace pressure regulator
Combustion air temperature changed Retune burner
Draft condition changed Check draft and outlet damper
Plugged or leaky FGR line Clean / repair
Gas control valve - low fire stop not set (if used) Adjust low fire stop
13 Fuel-Air-Ratios have changed Linkage wear Check linkage and tighten all joints
over time Fuel cam screws have moved Replace fuel cam
Air damper seal worn Replace air damper seals
Fuel lines plugged Check and clean lines, strainers & filters
Fuel control valve worn Replace fuel control valve
Gas orifices or gas manifold plugged Clean and/or replace
Combustion air temperature changed Retune burner
Draft condition changed Check draft and outlet damper
Vessel plugged Clean vessel
Plugged or leaky FGR valve Clean / repair
14 Cannot obtain capacity on Wrong spring range in regulator Install higher spring range
gas Too many elbows before control valve Rework piping to reduce elbows
Gas line too small, high pressure drop Use larger pipe size
Supply pressure lower then stated Increase supply pressure
Supply pressure drops too low at high fire Use larger gas line sizes / orifice in
service regulator
Regulator too small for flow and pressure Change regulator
15 Cannot obtain rated input on Oil nozzles plugged Replace nozzles
oil firing (pressure atomized) By-pass seal on nozzle leaking Replace nozzles
Page 43 TroubleshootingJB Manual
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