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3 Troubleshooting (continued)
Service Manual
47
Table 3G (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 5 - Hydronic Piping of the Knight Boiler
Installation and Operation Manual for boiler pump
specifications.
• Inspect the outlet sensors and associated wiring.
Measure the resistance of the sensors and compare to
the tables on page 38 of this manual.
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
Saved
(will require a manual
reset once the condition
has been corrected. Press
the RESET button on the
SMART TOUCH
display
to reset.)
After downloading parameters from a laptop,
the main control board must be reset.
• Press the RESET button on the SMART
TOUCH 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 5 - Hydronic Piping of the
Crest Installation and Operation Manual for the proper
piping methods for the Crest 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 5 - Hydronic Piping of the Crest
Installation and Operation Manual for boiler
pump specifications.