Service Manual
3Troubleshooting (continued)
Table 3E Troubleshooting Chart - Noisy System
FAULT | CAUSE |
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| - Supply gas problem. Natural gas pressures | • Refer to Section 7 - Gas Connections of the Knight | |||||
| should be between 4 inches w.c. (1.0 kPa) | XL Installation and Operation Manual for detailed | |||||
| and 14 inches w.c. (3.5 kPa). LP gas | information concerning the gas supply. |
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| pressures should be between 8 inches w.c. |
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| (2.0 kPa) and 14 inches w.c. (3.2 kPa). |
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| - Gas/air mixture problem. | • Refer to the Gas Valve Adjustment Procedure | on | ||||
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| page 41 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 | - Dirty/damaged burner. | • Refer to page 26 in this manual for the burner removal | |||||
| and inspection procedure. Clean or replace the burner | ||||||
Operation |
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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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| (82.7 kPa). |
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No Pump | - Blown fuse. | • Replace fuse F5 on the control board, see page 28 of | |||||
this manual. |
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Operation - |
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Boiler Pump | - Faulty pump. | • Replace pump. |
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System Pump |
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or | - Internal fault on control board. |
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DHW Pump | • Replace main control board. |
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| - Faulty pump relay. | • Replace relay. |
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| - System pressure exceeds relief valve | • Lower | the | system | pressure below the | 50 | psi |
Relief Valve | setting. | (344.7 kPa) rating of the supplied relief valve or replace | |||||
| the standard relief valve with a higher rated valve up to | ||||||
Opening |
| the maximum pressure of the heat exchanger. |
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| • Improperly sized expansion tank. |
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31 
