TROUBLE SHOOTING CHART
SYMPTOM |
| POSSIBLE CAUSES |
| CORRECTIVE ACTION |
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Flame too large | 1. | Defective operator section of valve. | 1. | Replace valve. |
| 2. | Burner orifice too large. | 2. | Check with local gas company for proper orifice |
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| size and replace. |
| 3. | If installed above 2,000 feet. | 3. | See orifice chart, page 10. |
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Yellow burner flame | 1. | Clogged burner ports. | 1. | Remove main burner and check for obstructions in |
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| throat, ports, and orifices. Clean - but do not enlarge |
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| ports or orifices. |
| 2. Obstructions around vent cap. | 2. | Make sure area around vent cap is clear, be sure | |
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| vent system is sealed. |
Gas Odor | 1. | Gas leak. | 1. | See Page 1. |
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Delayed Ignition | 1. | Pilot flame too small. | 1. | Adjust pilot flame. |
| 2. | Burner ports clogged at pilot. | 2. | Clean burner ports (do not enlarge). |
| 3. | Low gas pressure. | 3. | Check gas supply pressure. |
| 4. | Pilot decreases in size when main | 4. | Supply piping is too small. Consult local gas |
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| burners come on. |
| company or competent installer. |
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Failure to ignite | 1. | Main gas off. | 1. | Open all manual gas valves. |
| 2. | Thermostat not set high enough to call | 2. | Set thermostat to higher temperature. |
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| for heat. |
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| 3. | Clogged burner orifice. | 3. | Clean burner orifice (do not enlarge). |
| 4. | Thermostat wired wrong or defective. | 4. | Check wiring, jump across thermostat terminals at |
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| valve, if valve open, |
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Burner won’t turn off | 1. | Defective or damaged thermostat wire, | 1. | Can be checked by removing wire from valve terminal. |
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| or thermostat. |
| If valve goes off, replace wire or thermostat. |
| 2. | Thermostat location. | 2. | Follow instructions, check location. |
| 3. | Defective or sticking valve. | 3. | Replace valve. |
| 4. | Excessive gas pressure. | 4. | Contact utility supplying gas. |
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Incorrect gas input | 1. | Gas input not checked. | 1. | |
| 2. Clogged orifice. | 2. | Clean orifice with a smooth wood toothpick, | |
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| do not enlarge. |
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Not enough heat | 1. | Furnace undersized. | 1. | This is especially true when a dwelling or room is |
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| enlarged. Have the heat loss calculated and |
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| compare to furnace output. Your gas company can |
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| supply you with this information. If furnace is |
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| undersized, replace with correct size unit. |
| 2. | Thermostat set too low. | 2. | Raise temperature setting. |
| 3. | Incorrect supply pressure. | 3. | Check supply pressure. |
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Too much heat | 1. | Thermostat set too high. | 1. | Lower temperature setting. |
| 2. | Combination control valve stuck open. | 2. | Replace combination control valve. |
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Pilot and main burner | 1. | Weak thermocouple. | 1. | Check millivoltage and replace if low. |
go out during normal | 2. | Input too high. | 2. | Check input rate. |
operation | 3. | Cover around pilot lighter hole not | 3. | Tighten wing nuts securing cover and sight glass. |
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| air tight. |
| Check and replace gasket if needed. |
| 4. | Vent tubes not properly installed or | 4. | Follow instructions. Check both exhaust and air |
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| sealed. |
| intake tubes, and vent cap. Be sure all gaskets are |
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| in place and properly sealed. Use only tubes and |
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| vent cap supplied. Do not alter vent tubes or cap. |
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Page 16