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3
Troubleshooting
Table 3G (continued from previous page) Troubleshooting Chart - Fault Messages Displayed on Boiler Interface
FAULT
Flue Sensor
Shorted
(will require a manual
reset once the condition
has been corrected. Press
the RESET button on the
display to reset.)
Too Many
Resets - Try Later
Internal Fault
Flue Temp
Shutdown
Delta T
Shutdown
52
DESCRIPTION
The flue sensor has been shorted.
Too many manual resets have occurred
during a 15 minute period.
The main control board has detected an
internal fault.
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
• Check the sensor and its associated wiring. Repair
or replace the sensor or wiring if damaged.
• Measure the resistance of the sensors and compare
the resistance to the tables in this manual.
• Replace the sensor if necessary.
• Wait 15 minutes and try again.
• Turn power off to unit, wait 30 seconds and then turn
power back on.
• Replace the main control board.
• 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.
• Replace the main control board.
• 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 voltage to the boiler pump motor on a call
for heat. If voltage is not present, check the wiring
back to the pump relay. Replace the pump relay 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 Piping of the Crest
Installation and Operation Manual for boiler
pump specifications.
Service Manual
Operation
Manual
Reference
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