Crest Audio FBN0751 Service Manual page 44

3
Troubleshooting
Table 3G (continued from previous page) Troubleshooting Chart - Fault Messages Displayed on Boiler Interface
FAULT
Gas Valve / Relay
Failure 1
(will require a manual
reset once the condition
has been corrected. Press
the RESET button on the
SMART TOUCH display
to reset.)
Gas Valve / Relay
Failure 2
(will require a manual
reset once the condition
has been corrected. Press
the RESET button on the
SMART TOUCH display
to reset.)
Auto Reset
High Limit
44
DESCRIPTION
The main control board did not detect gas
valve 1.
The main control board did not detect gas
valve 2.
The outlet water temperature has exceeded
the setting of the automatic reset high limit.
CORRECTIVE ACTION
• Check wiring harness connection at the gas valve and
at the main control board.
• Replace the wire harness.
• Replace the gas valve.
• Replace the control board.
• Check wiring harness connection at the gas valve and
at the main control board.
• Replace the wire harness.
• Replace the gas valve.
• Replace the 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 120 vac to boiler pump motor on a call for
heat. If voltage is not present, check wiring back to
the main control board.
• Check the ARHL set point.
• If 120 vac is present on a call for heat and the boiler
pump is not operating, replace the pump.
• If the system pump is a variable speed pump, ensure
that the system flow is not less than the boiler flow.
• If operating on something other than an outlet sensor,
check temperature setting of the main control board.
• If the optional manual reset high limit has tripped,
check setting of the device.
• Check resistance of water sensors and compare to
Table 3B on page 39 of this manual.
sensor if necessary.
• Replace the main control board.
Service Manual
Operation Manual
Replace