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VHX SERIES STEAMER - TROUBLESHOOTING
SYMPTOM |
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| POSSIBLE CAUSES |
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Blower operating, no pilot gas flow. | 1. | Main gas supply turned OFF. | |
| 2. | Ignition module lockout. Turn power switch OFF for several | |
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| seconds then ON to reset the module. | |
| 3. | Air pressure switch: | |
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| A. Not mounted in true vertical position. | |
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| B. | Incorrect pressure setting. |
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| C. | Malfunctioning switch. |
| 4. | Malfunctioning Ignition module. | |
| 5. | Malfunctioning pilot gas valve. | |
| 6. | Blocked or dirty pilot gas orifice. | |
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Pilot flame not proving or lighting main | 1. | Gas not ON. | |
burner. | 2. | Incorrect manifold pressure for pilot gas. | |
| 3. | Poor connection between igniter and ignition cable. | |
| 4. | Fouled spark igniter. | |
| 5. | Incorrect gap in spark igniter. | |
| 6. | Faulty igniter or cracked insulation. | |
| 7. | Improper ground. | |
| 8. | Low water level in boiler or boiler not filling. | |
| 9. | Flame sensing current too low. | |
| 10. | Cracked or incorrect burner head attachment. | |
| 11. | Incorrect igniter positioning. | |
| 12. | Incorrect pilot orifice. | |
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Main burner not lighting correctly or | 1. | Blocked or dirty air orifice on blower. | |
excessive ignition noise. | 2. | Insufficient gas supply pressure. | |
| 3. | Incorrect gas pilot pressure. | |
| 4. | Incorrect gas manifold pressure. | |
| 5. | Pilot flame not sensing correctly. | |
| 6. | Burner tube insulation broken or deteriorated. | |
| 7. | Blocked or restricted flue. | |
| 8. | Incorrect pilot or main gas burner orifice size. | |
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Excess combustion noise or combustion | 1. | Blocked or dirty air orifice on blower. | |
induced harmonics. | 2. | Incorrect gas manifold pressure. | |
| 3. | Insufficient gas supply pressure. | |
| 4. | Steam vapors introduced into blower inlet. | |
| 5. | Loose flue connections. | |
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Boiler not maintaining set pressure | 1. | Leaking boiler blowdown valve. | |
and/or excessive burner on time. | 2. | Manual blowdown valve on water level probe housing open. | |
| 3. | Malfunctioning 13 psi overshoot relief valve. | |
| 4. | Low incoming gas supply pressure. | |
| 5. | Excessive load on steam outlet. | |
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F24700 (October 2001) |
| Page 62 of 68 |
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