Service Manual
3Troubleshooting
Table
FAULT | DESCRIPTION | CORRECTIVE ACTION | ||
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GV/Relay |
| • Check wiring harness connection at the gas valve and | ||
Fail |
| at the main control board. |
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(will require a manual | The main control board did not detect the |
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reset once the condition | • Replace the gas valve wire harness. |
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has been corrected. Press | gas valve. |
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the RESET button on the |
| • Replace the gas valve. |
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SMART SYSTEM display |
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to reset.) |
| • Replace the main control board. |
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| • Vent/air intake lengths exceed the maximum allowed | ||
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| lengths. Refer to Section 3 - General Venting of the | ||
Fan High |
| Knight XL Installation | and Operation | Manual for |
| proper lengths. |
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OR |
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Fan Speed High |
| • Check for obstruction | or blockage in | the vent/air |
(will require a manual |
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The actual fan RPM is 30% higher than what | intake pipes or at terminations. |
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reset once the condition |
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is being called for. |
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has been corrected. Press |
| • Check the wiring connections at the fan and at the | ||
the RESET button on the |
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| main control board. |
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SMART SYSTEM display |
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to reset.) |
| • Replace the fan. |
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| • Replace the main control board. |
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Sensor Open |
| • Check the sensors and their associated wiring. | ||
(will require a manual |
| Repair or replace the sensor or wiring if damaged. | ||
reset once the condition |
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has been corrected. Press | Either the inlet water or outlet water | • Measure the resistance of the sensors and compare | ||
the RESET button on the | temperature sensor has been disconnected. | the resistance to the tables on page 35 of this | ||
SMART SYSTEM display |
| manual. |
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to reset.) |
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| • Replace the sensor if necessary. |
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Sensor Shorted |
| • Check the sensors and their associated wiring. | ||
| Repair or replace the sensor or wiring if damaged. | |||
(will require a manual |
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reset once the condition | Either the inlet water or outlet water | • Measure the resistance of the sensors and compare | ||
has been corrected. Press | ||||
the RESET button on the | temperature sensor has been shorted. | the resistance to the tables on page 35 of this | ||
SMART SYSTEM display |
| manual. |
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to reset.) |
| • Replace the sensor if necessary. |
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Louver Proving |
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Sw |
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(will require a manual |
| • Check function of remote devices. |
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reset once the condition | An optional remote proving switch is not |
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has been corrected. Press | making. | • Check for loose or misplaced jumper if auxiliary | ||
the RESET button on the |
| proving switch is not installed. |
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SMART SYSTEM display |
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to reset.) |
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40
