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3 Troubleshooting
Service Manual
42
Table 3-4 (continued from previous page) Troubleshooting Chart - Fault Messages Displayed on Boiler Interface
FAULT DESCRIPTION CORRECTIVE ACTION
Outlet Temp
High
(continued)
Outlet water temperature has exceeded the
maximum outlet water temperature.
• Verify that the boiler pump is set to the proper speed
or that the boiler pump is the proper size. Reference
Section 6 - Hydronic Piping of the Knight XL
Installation and Operation Manual for boiler pump
specifications.
• Replace the main control board.
Rem Ctrl Flt
External control is cycling too often.
• Check set point of the external control.
• Check the wiring between the external control and the
unit.
• Replace the control.
Parameters
Progr
(will require a manual
reset once the condition
has been corrected. Press
the RESET button on the
SMART SYSTEM display
to reset.)
After downloading parameters from a laptop,
the main control board must be reset.
• Press the ENTER/RESET button on the SMART
SYSTEM display panel.
Service Blk
While the unit is in Service Mode, the outlet
temperature has exceeded 185°F.
• Establish a heating load to remove the heat from the
boiler loop.
• Verify that the system is full of water and that all air
has been properly purged from the system.
• Verify that the boiler is piped properly into the heating
system. Refer to Section 6 - Hydronic Piping of the
Knight XL Installation and Operation Manual for the
proper piping methods for the Knight XL boiler.
• Check 120 vac to the boiler pump motor on a call for
heat. If voltage is not present, check the wiring back
to the main control board. Replace the main control
board if necessary.
• If 120 vac is present on a call for heat and the boiler
pump is not operating, replace the pump.
• Verify that the boiler pump is set to the proper speed
or that the boiler pump is the proper size. Reference
Section 6 - Hydronic Piping of the Knight
XL Installation and Operation Manual for boiler
pump specifications.