Service Manual
3Troubleshooting
Table
FAULT | DESCRIPTION | CORRECTIVE ACTION | |
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| • Verify that the boiler pump is set to the proper speed | |
Outlet Temp |
| or that the boiler pump is the proper size. Reference | |
| Section 6 - Hydronic Piping of the | Knight XL | |
High | Outlet water temperature has exceeded the | Installation and Operation Manual for boiler pump | |
(continued) | maximum outlet water temperature. | specifications. |
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| • Replace the main control board. |
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| • Check set point of the external control. |
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| • Check the wiring between the external control and the | |
Rem Ctrl Flt | External control is cycling too often. | unit. |
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| • Replace the control. |
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Parameters |
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Progr |
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(will require a manual |
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reset once the condition | After downloading parameters from a laptop, | • Press the ENTER/RESET button on the SMART | |
has been corrected. Press | the main control board must be reset. | SYSTEM display panel. |
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the RESET button on the |
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SMART SYSTEM display |
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to reset.) |
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| While the unit is in Service Mode, the outlet | • Establish a heating load to remove the heat from the | |
| temperature has exceeded 185°F. | boiler loop. |
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| • Verify that the system is full of water and that all air | |
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| has been properly purged from the system. | |
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| • Verify that the boiler is piped properly into the heating | |
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| system. Refer to Section 6 - Hydronic Piping of the | |
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| Knight XL Installation and Operation Manual for the | |
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| proper piping methods for the Knight XL boiler. | |
Service Blk |
| • Check 120 vac to the boiler pump motor on a call for | |
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| heat. If voltage is not present, check the wiring back | |
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| to the main control board. Replace the main control | |
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| board if necessary. |
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| • If 120 vac is present on a call for heat and the boiler | |
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| pump is not operating, replace the pump. |
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| • Verify that the boiler pump is set to the proper speed | |
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| or that the boiler pump is the proper size. Reference | |
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| Section 6 - Hydronic Piping of | the Knight |
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| XL Installation and Operation Manual for boiler | |
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| pump specifications. |
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