Service Manual
3Troubleshooting
Table
FAULT | CAUSE |
| CORRECTIVE ACTION |
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| - Supply gas problem. | Natural gas | • Refer to Section 7 - Gas Connections of the Knight | |
| pressures should be between 4 inches | XL Installation and Operation Manual for detailed | ||
| w.c. and 14 inches w.c. LP gas pressures | information concerning the gas supply. |
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| should be between 8 inches w.c. and 14 |
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| inches w.c. |
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| - Gas/air mixture problem. |
| • Refer to the Gas Valve Adjustment Procedure | on |
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| page 45 of this manual for the proper gas valve setting. | |
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| Verify that the vent/air intake lengths do not exceed the | |
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| maximum listed in the General Venting section of the | |
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| Knight XL Installation and Operation Manual. |
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Noisy |
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- Dirty/damaged burner. |
| • Refer to page 31 in this manual for the burner removal | ||
Operation |
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| and inspection procedure. Clean or replace the burner | |
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| as necessary. |
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| - Low water flow through the heat exchanger. | • Refer to Section 6 - Hydronic Piping of | the | |
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| Knight XL Installation and Operation Manual for | |
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| minimum flow rates. Verify that the boiler is piped in a | |
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| primary/secondary fashion and that the boiler and | |
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| system pump are running on a call for heat. |
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| - Air in the piping system. |
| • Properly purge all air from the piping system. |
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| - Low system water pressure. |
| • Verify system pressure is a minimum of 12 psi. |
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No Pump | - Blown fuse. |
| • Replace fuse F1 on the control board, see page 33 of | |
Operation - |
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| this manual. |
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Boiler Pump |
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| Note: Make sure pump amperage does not exceed | |
System Pump |
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| 1.8 amps. |
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or |
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DHW Pump | - Faulty pump. |
| • Replace pump. |
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| - Internal fault on control board. | • Replace main control board. |
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| - System pressure exceeds relief valve | • Lower the system pressure below the 30 psi rating of | ||
Relief Valve | setting. |
| the supplied relief valve or replace the standard relief | |
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| valve with a higher rated valve up to the maximum | ||
Opening |
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| pressure of the heat exchanger. |
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| • Improperly sized expansion tank. |
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36 
