Service Manual
3Troubleshooting
Table 3F (continued from previous page) Troubleshooting Chart - Fault Messages Displayed on Boiler Interface
FAULT | DESCRIPTION | CORRECTIVE ACTION |
| The actual fan RPM is 30% higher than what | • Vent/air intake lengths exceed the maximum allowed |
| is being called for. | lengths. Refer to Section 3 - General Venting of the |
|
| Knight Wall Mount Installation and Operation Manual |
Fan High |
| for proper lengths. |
|
| |
OR |
| • Check for obstruction or blockage in the vent/air |
Fan Speed High |
| intake pipes or at terminations. |
(will require a manual |
| • Check the wiring connections at the fan and at the |
reset once the condition |
| |
has been corrected. Press |
| main control board. |
the RESET button on the |
| • Replace the fan. |
SMART SYSTEM display |
| |
|
| |
to reset.) |
| • Replace the main control board. |
|
| |
|
|
|
| Either the inlet water or outlet water | • Check the sensors and their associated wiring. |
Sensor Open | temperature sensor has been disconnected. | Repair or replace the sensor or wiring if damaged. |
|
| |
(will require a manual |
| • Measure the resistance of the sensors and compare |
reset once the condition |
| |
| the resistance to the tables on page 30 of this | |
has been corrected. Press |
| |
| manual. | |
the RESET button on the |
| |
|
| |
SMART SYSTEM display |
| • Replace the sensor if necessary. |
to reset.) |
| |
|
| |
|
|
|
| Either the inlet water or outlet water | • Check the sensors and their associated wiring. |
Sensor Shorted | temperature sensor has been shorted. | Repair or replace the sensor or wiring if damaged. |
(will require a manual |
| • Measure the resistance of the sensors and compare |
reset once the condition |
| |
| the resistance to the tables on page 30 of this | |
has been corrected. Press |
| |
| manual. | |
the RESET button on the |
| |
|
| |
SMART SYSTEM display |
| • Replace the sensor if necessary. |
to reset.) |
| |
|
| |
|
|
|
Aux. Proving | An optional remote proving switch is not | • Check function of remote devices. |
(will require a manual | making. | • Check for loose or misplaced jumper if auxiliary |
reset once the condition |
| |
has been corrected. Press |
| proving switch is not installed. |
the RESET button on the |
|
|
SMART SYSTEM display |
|
|
to reset.) |
|
|
|
|
|
36 
