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3 Troubleshooting
46
Service Manual
Table 3G (continued from previous page) Troubleshooting Chart - Fault Messages Displayed on Boiler Interface
FAULT DESCRIPTION CORRECTIVE ACTION
Louver Proving
Sw Open
(will require a manual
reset once the condition
has been corrected. Press
the RESET button on the
SMART TOUCH
display
to reset.)
An optional remote proving switch is not
making.
• Check function of remote devices.
• Check for loose or misplaced jumper if proving switch
is not installed.
Flue Temp High
The stack temperature has exceeded the set
parameters for the boiler.
• Inspect the heat exchanger. Reference page 35 of
this manual for the procedure on how to clean the flue
side of the heat exchanger.
• Inspect the flue sensor and associated wiring.
Measure the resistance of the flue sensor and
compare to Table 3E on page 38 of this manual.
Replace the sensor if necessary.
• Verify that the vent/air intake pipes are properly
installed and that there are no obstructions.
Delta T High
The temperature rise across the heat
exchanger has exceeded the set parameters
for the boiler.
• 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 for 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 pump is the proper size. Reference
Section 5 - Hydronic Piping of the Crest
Installation and Operation Manual for boiler
pump specifications.
• Inspect the inlet and outlet sensors and associated
wiring. Measure the resistance of the sensors and
compare to the tables on page 38 of this manual.
Outlet Temp
High
Outlet water temperature has exceeded the
maximum outlet water temperature.
• 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 for 120 vac to the boiler pump motor on a call
for heat. If voltage is not present, check 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.