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Symptom
C. Burner fires but then
trips primary control
D. Preheater assembly
not working
Possible Cause
1. Contaminated fuel supply
(water/antifreeze/gear lube),
dirty fuel filter
2. Improper draft
3. Clogged heat exchanger or
chimney
4. Incorrect air pressure
5. Incorrect fuel pressure
6. Improper combustion air baf-
fle setting/combustion blower
is defective
7. Oil primary control/flame
sensor defective, flame sensor
and/or turbulator improperly
adjusted/dirty
8. Clogged nozzle and/or pre-
heater assembly
1. Cartridge heater(s) defective/
disconnected
2. Snap disc defective
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49
Section 13 - Troubleshooting
Corrective Action
1. Drain and clean fuel-supply
tank; clean fuel filter
2. Ensure chimney is installed
properly and draft is set
3. Clean heater, including upper
manifold and chimney
4. Adjust flame settings (Section
11)
5. Check fuel supply (Section 6)
and flame adjustment (Sec-
tion 11)
6. Adjust flame (Section 11); test
combustion blower motor,
replace if necessary
7. Clean/test/adjust compo-
nents; replace if necessary
8. Clean/replace nozzle and/or
preheater assembly
1. Test cartridge heater(s) using
an Ohm meter:
Air heater = 112 Ω ±10%
Oil heater = 37 Ω ±10%
2. Test snap disc for continuty
when preheater is cold
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