Crest Audio FBN0751, Руководство по обслуживанию

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3
Troubleshooting
Table 3G (continued from previous page) Troubleshooting Chart - Fault Messages Displayed on Boiler Interface
FAULT DESCRIPTION CORRECTIVE ACTION
IO Expander Out
Error
The control board detected an internal fault.
• Turn the 120V power OFF. Wait 15 seconds, then turn
the 120V power back ON.
• Replace the control board.
Wrong
Personality Plug
The personality plug does not match the
personality plug value stored in memory.
• Remove the lower front jacket and compare the
personality plug value shown on the display with the
value on the personality plug label. If the two values
match, accept the new personality plug value.
• Check the connections at the personality plug
connector.
Air Metering
Valve Stuck
Closed
(will require a manual
reset once the condition
has been corrected. Press
the RESET button on the
display to reset.)
The air metering valve did not open when
needed.
• Check the voltage at connector X6, pin 13 at the start of
PrePurge. If not 24VAC, replace the control board.
• Check the wiring between the control board and the air
metering valve.
• Replace the air metering valve.
• Replace the control board.
• Check the slide switch on the inside of the air metering
valve actuator.
Air Metering
Valve Stuck
Open
(will require a manual
reset once the condition
has been corrected. Press
the RESET button on the
display to reset.)
The air metering valve did not close when
needed.
• Check the voltage at connector X6 pin 13 during the last
part of PrePurge. If 24VAC, replace the control board.
• Check the wiring between the control board and the air
metering valve.
• Replace the control board.
Failure ADC
Controller
(will require a manual
reset once the condition
has been corrected. Press
the RESET button on the
display to reset.)
A problem was detected with measuring one
or more temperature sensors.
• Check all connections between the temperature sensors
and the control board. Make sure all connections are
dry and secure.
• Connect a PC to the control board and open the Status
window. Look for temperature readings that are jumping
by more than 1°F.
• Check the resistance of all sensors (see page 39).
• Replace the control board.
The control board has detected an internal
fault.
• Turn the 120V power OFF. Wait 15 seconds, then turn
the 120V power back ON.
• Replace the control board.
Service Manual
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