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Problem Probable Causes Corrective Action
3000 displays
SERVICE
REQUIRED – ATO
BOARD
A. Loose or bad fuse
B. Bad Connection
C. ATO Board power loss
A. Ensure fuse on right side of ATO box
is secure and good. If the controller
above the ATO box is missing power,
check the fuse below the component
box.
B. With the controller OFF, press TEMP
button and ensure the ATO software
version appears. If not, the
connection between the controller
and the ATO board may be bad.
Ensure the 6-pin CAN connectors are
tight between controller (J6 and J7)
and ATO (J9 or J10) boards.
C. Power to the ATO board has been cut
off. Ensure there is correct voltage to
the ATO transformer. Restore power
to the board and clear any service
required errors.
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