Service Manual
3 Troubleshooting (continued)
Table 3G (continued from previous page) Troubleshooting Chart - Fault Messages Displayed on Boiler Interface
FAULT | DESCRIPTION |
| CORRECTIVE ACTION |
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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 5 - Hydronic Piping of the Knight | Boiler |
Outlet Temp |
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| Installation and Operation Manual for boiler pump | |
High | Outlet water temperature has exceeded the |
| specifications. |
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(continued) | maximum outlet water temperature. | • | Inspect the outlet sensors and associated wiring. | |
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| Measure the resistance of the sensors and compare to | |
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| the tables on page 38 of this manual. |
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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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Saved |
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(will require a manual |
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reset once the condition | After downloading parameters from a laptop, | • Press the RESET button on the | SMART | |
has been corrected. Press | the main control board must be reset. |
| TOUCH display panel. |
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the RESET button on the |
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SMART TOUCH 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 5 - Hydronic Piping of the | |
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| Crest Installation and Operation Manual for the proper | |
Service Blk |
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| piping methods for the Crest boiler. |
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| • 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 5 - Hydronic Piping of the Crest | |
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| Installation and Operation Manual for | boiler |
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| pump specifications. |
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47 
