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3
Troubleshooting
Table 3G (continued from previous page) Troubleshooting Chart - Fault Messages Displayed on Boiler Interface
FAULT
IO Expander Out
Error
The control board detected an internal fault.
A problem was detected with measuring one
or more temperature sensors.
Failure ADC
Controller
(will require a manual
reset once the condition
has been corrected. Press
the RESET button on the
display to reset.)
The control board has detected an internal
fault.
Outlet Sensor
Differential
(will require a manual
The readings from the two outlet temperature
reset once the condition
sensors are too far apart.
has been corrected. Press
the RESET button on the
display to reset.)
Flue Sensor
Differential
(will require a manual
The readings from the two flue temperature
reset once the condition
sensors are too far apart.
has been corrected. Press
the RESET button on the
display to reset.)
54
DESCRIPTION
CORRECTIVE ACTION
• Turn the power OFF. Wait 15 seconds, then turn the
power back ON.
• Replace the control board.
• 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 this manual).
• Replace the control board.
• Turn the power OFF. Wait 15 seconds, then turn the
power back ON.
• Replace the control board.
• Check all connections between the outlet temperature
sensors and the control board.
connections are dry and secure.
• Check the resistance of the two outlet sensors (see
this manual).
• Replace the control board.
• Check all connections between the flue temperature
sensors and the control board.
connections are dry and secure.
• Check the resistance of the two flue sensors (see this
manual).
• Replace the control board.
Service Manual
Make sure all
Make sure all
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