Testing Ato Rtd Probes - Frymaster OCF30 Service & Parts Manual

Problem
One vat tops off but
other vats fail to top off.
Incorrect vat tops off.
3000 displays
SERVICE
REQUIRED – ATO
BOARD

1.11.2 Testing ATO RTD probes.

The controller features a quick way to compare the temperature of the ATO RTD to the vat
temperature. This is useful for diagnosing ATO issues.
With the controller OFF, press and hold the TEMP button. The controller will display AIF and -----
followed by ATO and current resistance temperature. Ignore the AIF display. Compare the resistance
of the ATO probe against the controller reading. If the values differ greatly a harness issue may exist.
Probable Causes
A.
Failed solenoid
B.
Loose wire connection.
A.
Wired incorrectly.
B.
Flexlines connected to wrong vat.
A.
Loose or bad fuse
B.
Bad Connection
C.
ATO Board power loss
A.
Check power to the pump.
pump is hot, the solenoid has probably
failed.
B.
Ensure all wiring harnesses are
securely connected to ATO board and
solenoids.
A.
Ensure wires are wired correctly.
B.
Switch flexlines to correct vat.
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
connection between the ATO and the
controller may be bad. Ensure the 6-
pin
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.
1-16
Corrective Action
appears. If not,
CAN connectors are
If the
the
tight