Service Manual
3 Troubleshooting
Table
FAULT |
| CAUSE | CORRECTIVE ACTION |
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| - Supply gas problem. Natural gas pressures |
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| should be between 4 inches w.c. and | • Refer to Section 7 - Gas Connections of the Knight | ||
| 14 inches w.c. | LP gas pressures should | Boiler Installation and Operation Manual for detailed | |
| be between | 8 inches w.c. and | information concerning the gas supply. |
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| 14 inches w.c. |
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| • Refer to the Gas Valve Adjustment Procedure | on |
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| page 47 of this manual for the proper gas valve setting. | |
| - Gas/air mixture problem. | 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 Boiler Installation and Operation Manual. |
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Noisy |
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| • Refer to page 31 in this manual for the burner removal | |
- Dirty/damaged burner. | and inspection procedure. Clean or replace the burner | |||
Operation |
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| as necessary. |
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| • Refer to Section 6 - Hydronic Piping of | the |
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| Knight Boiler Installation and Operation Manual for | |
| - Low water flow through the heat exchanger. | 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 |
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| • Replace fuse F1 on the control board, see page 33 of | |
Operation - | - Blown fuse. |
| this manual. |
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Boiler Pump |
| 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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| • Lower the system pressure below the 30 psi rating of | |
Relief Valve |
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| the supplied relief valve or replace the standard relief | |
- System pressure exceeds relief valve | valve with a higher rated valve up to the maximum | |||
Opening | setting. |
| pressure of the heat exchanger. |
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| • Improperly sized expansion tank. |
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36 
