TROUBLESHOOTING
Table 8.2: Boiler Troubleshooting Guide (Burners Functioning)
Problem
Possible Causes
Corrective Actions
| Burners not functioning. | 1. See Figure 8.2 | 1. See Figure 8.2 |
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| Burners will not shut | 1. Defective gas valve. | 1. | Use Figure 8.2 to troubleshoot intermittent |
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| down. |
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| ignition gas valve. Replace if necessary. |
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| 2. | Short circuit. | 2. | Check and correct wiring. |
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| Flashback or burning | 1. Manifold gas pressure too low. | 1. | Adjust to proper pressure. |
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| at orifice spuds. | 2. | Improperly sized/drilled orifice spuds. | 2. | Install correct spuds. |
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| 3. | Leaking gas valve. | 3. | Replace valve. |
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| 4. | Burrs on orifice. | 4. | Remove burrs. |
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| 5. | Low supply gas pressure. | 5. | Contact gas supplier if natural gas. Adjust |
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| regulator if LP gas. |
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| Delayed ignition. | 1. Insufficient pilot flame. | 1. | Increase pilot gas flow. |
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| 2. | Pilot burner/orifice clogged. | 2. | Clean pilot burner and orifice. |
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| 3. | Overfiring. | 3. | Reduce rate to input on rating label. |
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| 4. | Misaligned burners or pilot. | 4. | Realign burners or pilot. |
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| Condensation at boiler | 1. Vent pipe not sloped towards vent terminal. | 1. | Install condensate trap per vent manufacturer’s |
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| vent connector/fan. |
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| . instructions. |
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| 2. | Slope vent pipe towards vent terminal. |
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| Boiler not heating | 1. Underfiring. | 1. | Increase rate to input on rating label. |
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| properly. | 2. | Limit set too low. | 2. | Reset limit to higher setting. |
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| 3. | Air in system. | 3. | Vent air from all points in system. |
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| 4. | Circulator malfunctioning. | 4. | Check circulator, replace if necessary. |
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| 5. | Circulation system clogged. | 5. | Shut down and cool boiler, drain and flush |
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| system. |
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| 6. | Incorrect thermostat heat anticipator setting. | 6. | Adjust heat anticipator to 0.2 Amp. |
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| Fumes or gas odors | 1. Leaks in gas piping or fittings. | 1. Locate and repair or replace. |
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| 2. Leaks in gas service line or meter. | 2. Shut down boiler and notify gas provider. |
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| 3. Obstructed chimney. | 3. Check, repair and/or clean chimney. |
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| 4. Obstructed flueways or vent. | 4. Clean flueways or vent and remove obstructions. |
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| 5. Draft problem in boiler room. | 5. Check air supply, ventilation and venting system. |
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| 6. Overfiring. | 7. Reduce rate to input on rating label. |
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