28141 Rev A 10-27-06
27
Problem Possible
Cause
Remedy
Excessive fuel oil
consumption.
(continued)
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
influenced by drafts, sunlight, duct work, etc., relocate
to more suitable location.
Insufficient combustion
air adjustment at oil
burner, or improper draft
pressure.
Adjust the oil burner combustion air band and draft
regulator to gain the highest CO
2
possible with a
Bacharach No. 1 smoke.
Too much smoke.
Heat exchanger partially
clogged.
Check for soot build-up in heat exchanger flue
passages, especially in the outer radiator.
Poor alignment between
oil burner blast tube and
fire pot.
Check alignment. blast tube should be centered with
fire pot burner opening. Oil burner head should be ¼
inch back from the inside surface of the fire pot.
Flame impingement
caused by Incorrect
nozzle angle.
Check nozzle size and angle. (See Appendix A). Check
distance from head to inside surface of the fire pot.
Soot building up on
blast tube (end
coning).
Defective fire-pot
Check fire-pot. Repair or replace.
Air flow blocked or dirty
air filter.
Clean or replace air filter.
Thermostat adjustments
or location.
Check thermostat heat anticipator setting against
measured amperage draw. Increase heat anticipator
setting if necessary. If the thermostat is being
influenced by drafts, sunlight, duct work, etc., relocate
to more suitable location.
Insufficient air flow.
Check all dampers. Open closed dampers including
registers in unused rooms. Check system temperature
rise. If temperature rise is too high, speed up blower
fan.
Defective high limit
control.
Test high limit function of all limit switches. Use a duct
thermometer to assess accuracy of limit control. Check
for obstructions to airflow around limit switch bi-metal
elements. Replace control if necessary.
Under-sized nozzle.
Check nozzle. If problem is not caused by air flow
problems, use larger nozzle, if permitted by rating plate.
Blower fan motor
stopping intermittently on
overload.
Check blower fan motor amperage draw. Check motor
ventilation ports, clean if necessary. Replace motor if
necessary.
Furnace will not
warm home to
desired temperature
Burner motor stopping
intermittently on overload.
Check burner motor. Replace if necessary.
Home does not heat
evenly
Improper distribution of
heat.
This is not likely to be a furnace problem. Balance duct
system.
Air flow blocked or dirty
air filter.
Clean or replace air filter.
Supply air
temperature too hot.
Insufficient air flow.
Check all dampers. Open closed dampers including
registers in unused rooms. Check system temperature
rise. If temperature rise is too high, speed up blower
fan.
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