| Odor, soot and smoky fire |
1. Insufficient combustion air |
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2. Lack of proper draft |
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3. Cracked/plugged heat exchanger |
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4. Burner not adjusted properly with combustion kit |
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5. Improper setting of barometric draft control |
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6. Oil leaks |
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7. Wrong nozzle size, or nozzle worn or partially clogged |
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8. Improper setting of electrodes |
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9. Plugged oil filter |
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10. Fuel pump cutoff valve not cutting off |
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11. Nozzle or electrodes improperly positioned |
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12. Leakage on return side of air distribution system |
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13. After drip, reflected heat, or impingement of flame |
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14. Improper or distorted end cone |
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15. Air leakage into oil pump supply line |
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16. Burner blower air inlet restricted or burner blower wheel dirty |
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17. Restricted flue |
| Delayed ignition |
1. Cracked, dirty or loose electrodes |
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2. Electrodes not properly adjusted |
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3. Incorrect nozzle |
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4. Improper primary air adjustment |
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5. Faulty ignition transformer |
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6. Water in fuel oil |
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7. Incorrect pump pressure |
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8. Furnace not properly set-up |
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9. Air leakage into oil supply line |
| Burner will not operate |
1. Open switch |
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2. Open fuse or circuit breaker |
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3. Burner motor overload open |
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4. Thermostat improperly set |
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5. Burner primary control safety open |
| Burner motor runs but does not (ire |
1. Oil supply insufficient |
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2. Faulty oil pump |
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3. Broken oil pump drive coupling |
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4. Coke deposits on electrodes |
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5. Air in oil supply line |
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6. Restricted oil supply line |
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7. Clogged nozzle |
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8. Restricted oil line filter |
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9. Leak in oil line |
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10. Failed ignition transformer |
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11. Electrodes not properly set |
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12. Dirty fire detector |
| Pulsations |
1. Improper nozzle |
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2. Inadequate draft |
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3. Air in oil line |
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4. Clogged flue |
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5. Furnace not properly set-up |
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6. Partially clogged pump strainer or oil line filter |
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7. Nozzle plugged |
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8. Nozzle too far forward in air tube |
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9. Barometric damper set wide open |
| Cad cell not functioning |
1. Requires direct view of flame |
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2. External light effecting cell operation |
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3. Remove cad cell and check with an ohmmeter: |
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a. With cad cell covered, the resistance should be over 100K ohms |
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b. With cad cell exposed to room light, the resistance should be under 1.5 K ohms |
| Low CO.’ |
1. High draft through furnace |
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2. Improper primary air adjustment |
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3. Damaged combustion chamber |
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4. Faulty nozzle |
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5. Incorrect oil pressure |
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6. Draft regulator improperly set |
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7. Incorrect fuel/air mixture |
| High stack temperatures |
1. Damaged combustion chamber |
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2. Furnace not set-up with combustion kit |
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3. Undersized return air |
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4. Overfired furnace |
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5. Dirty heat exchanger |
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6. High draft, barometric damper not properly set |
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7. Excessive temperature rise |
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8. Air shutter adjustment open too much. |
| High smoke reading |
1. Lack of combustion air |
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2. Inadequate overfire draft |
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3. Incorrect oil pressure |
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4. Dirty burner blower wheel |
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5. Incorrect nozzle |
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6. Faulty oil pump |
| Burner motor runs but does not fire |
7. Dirty oil |
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8. Burner motor not obtaining full speed |
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9. Damaged combustion chamber |
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10. Flame impingement |
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11. Incorrect fuel/air mixture |
| Poor draft – overfire and stack |
1. Improperly sized chimney or not enough chimney height |
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2. Holes or cracks in chimney |
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3. Restricted chimney |
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4. Too many 90 degree elbows in vent pipe |
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5. Outside chimney too cool |
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6. Cool flue gases |
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7. Barometric damper not properly set, sticking or in wrong location |
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8. Oil furnace and fireplace chimney interconnected |
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9. Heat exchanger passages plugged |
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10. Overfired furnace |
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11. Improper air shutter adjustment |
| Noisy Operation |
1. Bad coupling alignment |
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2. Air in oil supply line (use only good flare fittings) |
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3. Tank hum on two-pipe system and inside tank |
