1.1 ATO (Automatic Top-off) Service Procedures
The automatic top-off system is activated when the oil level falls below a sensor in the rear of the
frypot. The signal is sent to the ATO board to engage the solenoid to the frypot and turn on the
ATO pump. The pump draws oil from the JIB (Jug In Box) to a port in the rear of the frypot.
Once the oil level has satisfied the sensor, the pump and solenoid turn off.
The ATO board is located inside the box, behind the
JIB (see Figure 1). The power for the ATO board in
electric fryers is supplied from the right hand
component box. On gas fryers the power is supplied
from the transformer box in the rear of the fryer. The
power passes through the transformer inside the ATO
box to the board. On the left side of the ATO box is
a power switch, which controls the flow of power
between the component/transformer box and the
ATO board.
Figure 1 Close up of
switch located
on the left side
of the JIB auto
top off box.
1.1.1 ATO (Automatic Top-off) Troubleshooting
Problem Probable Causes Corrective Action
The yellow JIB low
light won’t
illuminate.
A. Auto top off power switch is off.
B. Power in the component box is
not present.
C. Failed transformer.
D. Loose wire connection
A. Verify that the auto top off
power switch is switched on.
The switch is located behind the
JIB on the left side of the auto
top off control box.
B. Ensure power is present in the
component box.
C. If power is present in
component box, check the
transformer for correct voltage.
D. Ensure the yellow LED is
securely attached to plug J6 on
the ATO board.
One vat tops off but
other vats fail to top
off.
A. Failed solenoid
B. Loose wire connection.
A. Check power to the pump. If
the pump is hot, the solenoid
has probably failed.
B. Ensure all wiring harnesses are
securely connected to ATO
board and solenoids.
Incorrect vat tops
off.
A. Wired incorrectly.
B. Flexlines connected to wrong vat.
A. Ensure wires are wired
correctly.
B. Switch flexlines to correct vat.
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