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3
Troubleshooting
Table 3G (continued from previous page) Troubleshooting Chart - Fault Messages Displayed on Boiler Interface
FAULT
Fan Speed High
(will require a manual
reset once the condition
has been corrected. Press
the RESET button on the
SMART TOUCH display
to reset.)
Louver Proving
Sw Open
Flue Temp High
Delta T High
50
DESCRIPTION
The actual fan RPM is 30% higher than what
is being called for.
An optional remote proving switch is not
making.
The stack temperature has exceeded the set
parameters for the boiler.
The temperature rise across the heat
exchanger has exceeded the set parameters
for the boiler.
CORRECTIVE ACTION
• Vent/air intake lengths exceed the maximum allowed
lengths. Refer to Section 2 - General Venting of the
Crest
Installation
and
proper lengths.
• Check for obstruction or blockage in the vent/air
intake pipes or at terminations.
• Check the wiring connections at the fan and at the
main control board.
• Replace the fan.
• Check function of remote devices.
• Check for loose or misplaced jumper if proving switch
is not installed.
• Inspect the heat exchanger. Reference 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 of this manual. Replace the sensor if necessary.
• Verify that the vent/air intake pipes are properly
installed and that there are no obstructions.
• 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
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.
Section
5
-
Hydronic
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 in this manual.
Service Manual
Operation
Manual
for
Operation
Manual
Reference
Piping
of
the
Crest
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