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VF BOILER SERVICE MANUAL
AOS WPC - Tech Training 44 of 72 Ashland City, TN © 2007
Servicing should only be performed by a Qualified Service Agent
ERROR MESSAGES (CONT)
DISPLAYED MESSAGE
CONDITION/INDICATES
CHECK/REPAIR
“Config Key CRC”
Data read from the Config Key by the MCB was not
properly confirmed at power up.
The Config Key contains model specific (Btu/hr &
fuel type) blower speed programing data. This data
is written to the MCB’s internal memory at power up.
The MCB then uses this data to instruct the VFD
(variable frequency drive) to modulate blower speed
during various operating states.
Important Service Reminder:
When performing any troubleshooting steps outlined
in this service manual always consider the wiring
and connectors between components. Perform a
close visual inspection of all wiring and connectors
to a given component before replacement.
Ensure wires were stripped before being crimped in
a wire connector, ensure wires are crimped tightly in
their connectors, ensure connection pins in sockets
and plugs are not damaged or worn, ensure plugs
and sockets are mating properly and providing good
contact.
Failure to perform this critical step or failing to
perform this step thoroughly often results in
needless down time, unnecessary parts
replacement, and customer dissatisfaction.
• Ensure the Config Key is securely plugged into
the J23 socket on the MCB circuit board (see
pages 14 and 34).
• Turn power off to the boiler for 1 minute and
then turn power back on. Press the Select but-
ton on the UIM to clear any error messages.
This will provide the MCB a second attempt to
read and store data from the Config Key.
• Closely inspect Config Key plug pins - if dam-
aged replace the config key.
• Install a new Config Key for the correct Btu/hr
model and fuel type if this error message contin-
ues.
• Closely inspect the pins in the J23 socket on the
MCB for signs of wear or damage.
“Config Key Part”
MCB has detected the Config Key is defective.
The Config Key contains model specific (Btu/hr &
fuel type) blower speed programing data. This data
is written to the MCB’s internal memory at power up.
The MCB then uses this data to instruct the VFD
(variable frequency drive) to modulate blower speed
during various operating states.
• Turn power off to the boiler for 1 minute and
then turn power back on. Press the Select but-
ton on the UIM to clear any error messages.
This will provide the MCB a second attempt to
read and store data from the Config Key.
• Install a new Config Key for the correct Btu/hr
model and fuel type. See pages 14 and 34.