Manual

18
Beckett NX: System and General Troubleshooting
Problem Possible Cause Remedy
Oil burner sputtering at nozzle
Electrodes out of adjustment or
defective.
• Check electrode settings. Check electrodes for dirt build-up or cracks in
porcelain.
Poor transformer high voltage
connections or defective
transformer.
• Check contacts between the igniter and electrodes. If OK, replace the igniter
Fuel oil fi lter clogged.
• Replace fuel oil storage tank fi lter and / or fuel oil in-line fi lter.
Defective oil pump.
• Check burner motor / fuel oil pump coupling. Check oil pump pressure.
Replace fuel oil pump if necessary.
Fuel oil line partially clogged or
contains air.
• Bleed air from oil line. If problem persists, replace oil line.
Blocked Vent Safety Circuit
opening intermittently. (Boiler
lights, then turns off)
• Check pressure switch on BVS to ensure it remains closed.
• Pressure switch open.
• Check pressure tubes for proper connection or possible obstructions.
• Check venting for blockage.
• Reduce burner head opening.
• Check combustion air intake for blockage.
• Check pressure switch operation.
Excessive fuel oil consumption.
Fuel oil leak.
• Check fuel oil line for leaks. Repair or replace if necessary.
Thermostat improperly adjusted or
in poor location.
• Check thermostat heat anticipator setting against measured amperage draw.
Increase heat anticipator setting if necessary. If the thermostat is being
infl uenced by drafts, sunlight, duct work, etc., relocate to more suitable
location.
Too much smoke.
Insuffi cient combustion air
adjustment at oil burner, or
improper draft pressure.
• Check CO2. Should be 11.5% to 12%
Heat exchanger partially clogged.
• Check for soot build-up in heat exchanger fl ue passages, especially in the
outer radiator.
Soot building up on blast tube (end
coning).
Flame impingement caused by
Incorrect nozzle angle.
• Check nozzle size and angle. (See Appendix A). Check distance from head to
inside surface of the fi re pot.
Boiler will not warm home to desired
temperature.
Thermostat adjustments or
location.
• Check thermostat heat anticipator setting against measured amperage draw.
Increase heat anticipator setting if necessary. If the thermostat is being
infl uenced by drafts, sunlight, duct work, etc., relocate to more suitable
location.
Insuffi cient water fl ow.
• Check all registers.
Defective high limit control.
• Test high limit function of all limit switches. Use a duct thermometer to assess
accuracy of limit control. Replace control if necessary.
Under-sized nozzle.
• Check nozzle and nozzle fi lter for dirt.
Burner motor stopping
intermittently on overload.
• Check burner motor. Pressure switch opening due to blocked vent. Replace if
necessary.
Home does not heat evenly Improper distribution of heat.
• This is not likely to be a Boiler problem. Balance duct system.
OPERATION AND TROUBLESHOOTING